diff --git a/images/datascience.svg b/images/datascience.svg
index dab5f3d..23c9cb0 100644
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+++ b/images/datascience.svg
@@ -1,3 +1,3 @@
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text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" dir="ltr" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 344px; margin-left: 455px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: #FFFFFF; line-height: 1.2; pointer-events: all; white-space: nowrap; ">Continuous distributions (pdf's)</div></div></div></foreignObject><text x="455" y="348" fill="#FFFFFF" font-family="Helvetica" font-size="12px" text-anchor="middle">Continuous distributions (pd...</text></switch></g></a><path d="M 70 449 Q 5 449 5 436.5 Q 5 424 20 424" fill="none" stroke="#1b3cb3" stroke-miterlimit="10" stroke-dasharray="1 2" pointer-events="stroke"/><a xlink:href="https://en.wikipedia.org/wiki/Cumulative_distribution_function"><rect x="70" y="441.5" width="180" height="15" rx="2.25" ry="2.25" fill="#000000" stroke="#000000" transform="translate(2,3)" opacity="0.25"/><rect x="70" y="441.5" width="180" height="15" rx="2.25" ry="2.25" fill="#878787" stroke="#000000" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; 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text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" dir="ltr" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 394px; margin-left: 455px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: #FFFFFF; line-height: 1.2; pointer-events: all; white-space: nowrap; ">Discrete distributions (pmf's)</div></div></div></foreignObject><text x="455" y="398" fill="#FFFFFF" font-family="Helvetica" font-size="12px" text-anchor="middle">Discrete distributions (pmf'...</text></switch></g></a><a xlink:href="https://en.wikipedia.org/wiki/Chi-squared_distribution"><rect x="689.5" y="164" width="120" height="20" rx="3" ry="3" fill="#000000" stroke="#000000" transform="translate(2,3)" opacity="0.25"/><rect x="689.5" y="164" width="120" height="20" rx="3" ry="3" fill="#878787" stroke="#000000" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; 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text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" dir="ltr" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 271px; margin-left: 750px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #FFFFFF; line-height: 1.2; pointer-events: all; white-space: nowrap; "><font face="sans-serif">Multinomial</font></div></div></div></foreignObject><text x="750" y="274" fill="#FFFFFF" font-family="Helvetica" font-size="11px" text-anchor="middle">Multinomial</text></switch></g></a><path d="M 689.5 295.5 Q 614.76 295.52 614.76 344.76 Q 614.76 394 540 394" fill="none" stroke="#1f6286" stroke-miterlimit="10" stroke-dasharray="1 2" pointer-events="stroke"/><a xlink:href="https://en.wikipedia.org/wiki/Hypergeometric_distribution"><rect x="689.5" y="285.5" width="120" height="20" rx="3" ry="3" fill="#000000" stroke="#000000" transform="translate(2,3)" opacity="0.25"/><rect x="689.5" y="285.5" width="120" height="20" rx="3" ry="3" fill="#878787" stroke="#000000" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" dir="ltr" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 296px; margin-left: 750px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #FFFFFF; line-height: 1.2; pointer-events: all; white-space: nowrap; "><font face="sans-serif">Hypergeometric</font></div></div></div></foreignObject><text x="750" y="299" fill="#FFFFFF" font-family="Helvetica" font-size="11px" text-anchor="middle">Hypergeometric</text></switch></g></a><path d="M 689.5 320.5 Q 614.76 320.52 614.76 357.26 Q 614.76 394 540 394" fill="none" stroke="#1f6286" stroke-miterlimit="10" stroke-dasharray="1 2" pointer-events="stroke"/><a xlink:href="https://en.wikipedia.org/wiki/Poisson_distribution"><rect x="689.5" y="310.5" width="120" height="20" rx="3" ry="3" fill="#000000" stroke="#000000" transform="translate(2,3)" opacity="0.25"/><rect x="689.5" y="310.5" width="120" height="20" rx="3" ry="3" fill="#878787" stroke="#000000" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" dir="ltr" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 321px; margin-left: 750px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #FFFFFF; line-height: 1.2; pointer-events: all; white-space: nowrap; "><font face="sans-serif">Poisson</font></div></div></div></foreignObject><text x="750" y="324" fill="#FFFFFF" font-family="Helvetica" font-size="11px" text-anchor="middle">Poisson</text></switch></g></a><rect x="625" y="384" width="184" height="20" rx="3" ry="3" fill="#000000" stroke="#000000" transform="translate(2,3)" opacity="0.25"/><rect x="625" y="384" width="184" height="20" rx="3" ry="3" fill="#878787" stroke="#000000" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" dir="ltr" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 394px; margin-left: 717px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #FFFFFF; line-height: 1.2; pointer-events: all; white-space: nowrap; "><font face="sans-serif"><a href="https://en.wikipedia.org/wiki/Expected_value"><font color="#ffffff">Expectation</font></a><font> and </font><a href="https://en.wikipedia.org/wiki/Mean"><font color="#ffffff">mean</font></a></font></div></div></div></foreignObject><text x="717" y="397" fill="#FFFFFF" font-family="Helvetica" font-size="11px" text-anchor="middle">Expectation and mean</text></switch></g><rect x="370" y="479" width="170" height="30" rx="4.5" ry="4.5" fill="#1f6286" stroke="#000000" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" dir="ltr" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 494px; margin-left: 455px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: #FFFFFF; line-height: 1.2; pointer-events: all; white-space: nowrap; ">Important Laws</div></div></div></foreignObject><text x="455" y="498" fill="#FFFFFF" font-family="Helvetica" font-size="12px" text-anchor="middle">Important Laws</text></switch></g><path d="M 540 444 Q 582.52 444 582.52 419 Q 582.52 394 625 394" fill="none" stroke="#1f6286" stroke-miterlimit="10" stroke-dasharray="1 2" pointer-events="stroke"/><rect x="370" y="429" width="170" height="30" rx="4.5" ry="4.5" fill="#000000" stroke="#000000" transform="translate(2,3)" opacity="0.25"/><rect x="370" y="429" width="170" height="30" rx="4.5" ry="4.5" fill="#1f6286" stroke="#000000" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" dir="ltr" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 444px; margin-left: 455px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: #FFFFFF; line-height: 1.2; pointer-events: all; white-space: nowrap; ">Summary statistics</div></div></div></foreignObject><text x="455" y="448" fill="#FFFFFF" font-family="Helvetica" font-size="12px" text-anchor="middle">Summary statistics</text></switch></g><path d="M 370 544 Q 370 550 357.5 550 Q 345 550 345 599.5 Q 345 649 298 649" fill="none" stroke="#1f6286" stroke-miterlimit="10" stroke-dasharray="1 2" pointer-events="stroke"/><path d="M 370 544 Q 370 550 357.5 550 Q 345 550 345 614.5 Q 345 679 298 679" fill="none" stroke="#1f6286" stroke-miterlimit="10" stroke-dasharray="1 2" pointer-events="stroke"/><a xlink:href="https://en.wikipedia.org/wiki/Estimation_theory"><rect x="370" y="529" width="170" height="30" rx="4.5" ry="4.5" fill="#000000" stroke="#000000" transform="translate(2,3)" opacity="0.25"/><rect x="370" y="529" width="170" height="30" rx="4.5" ry="4.5" fill="#1f6286" stroke="#000000" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" dir="ltr" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 544px; margin-left: 455px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: #FFFFFF; line-height: 1.2; pointer-events: all; white-space: nowrap; ">Estimation</div></div></div></foreignObject><text x="455" y="548" fill="#FFFFFF" font-family="Helvetica" font-size="12px" text-anchor="middle">Estimation</text></switch></g></a><path d="M 540 594 Q 540 594 639.5 594" fill="none" stroke="#1f6286" stroke-miterlimit="10" stroke-dasharray="1 2" pointer-events="stroke"/><a xlink:href="https://en.wikipedia.org/wiki/Statistical_hypothesis_testing"><rect x="370" y="579" width="170" height="30" rx="4.5" ry="4.5" fill="#000000" stroke="#000000" transform="translate(2,3)" opacity="0.25"/><rect x="370" y="579" width="170" height="30" rx="4.5" ry="4.5" fill="#1f6286" stroke="#000000" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" dir="ltr" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 594px; margin-left: 455px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: #FFFFFF; line-height: 1.2; pointer-events: all; white-space: nowrap; ">Hypothesis Testing</div></div></div></foreignObject><text x="455" y="598" fill="#FFFFFF" font-family="Helvetica" font-size="12px" text-anchor="middle">Hypothesis Testing</text></switch></g></a><a xlink:href="https://en.wikipedia.org/wiki/Confidence_interval"><rect x="370" y="629" width="170" height="30" rx="4.5" ry="4.5" fill="#000000" stroke="#000000" transform="translate(2,3)" opacity="0.25"/><rect x="370" y="629" width="170" height="30" rx="4.5" ry="4.5" fill="#1f6286" stroke="#000000" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; 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text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" dir="ltr" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 419px; margin-left: 717px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #FFFFFF; line-height: 1.2; pointer-events: all; white-space: nowrap; "><font face="sans-serif"><font color="#ffffff"><a href="https://en.wikipedia.org/wiki/Variance"><font color="#ffffff">Variance</font></a> </font>and <a href="https://en.wikipedia.org/wiki/Standard_deviation"><font color="#ffffff">standard deviation (sd)</font></a></font></div></div></div></foreignObject><text x="717" y="422" fill="#FFFFFF" font-family="Helvetica" font-size="11px" text-anchor="middle">Variance and standard deviation (...</text></switch></g><path d="M 625 444 Q 625 444 540 444" fill="none" stroke="#1f6286" stroke-miterlimit="10" stroke-dasharray="1 2" pointer-events="stroke"/><rect x="625" y="434" width="185" height="20" rx="3" ry="3" fill="#000000" stroke="#000000" transform="translate(2,3)" opacity="0.25"/><rect x="625" y="434" width="185" height="20" rx="3" ry="3" fill="#878787" stroke="#000000" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; 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text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" dir="ltr" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 494px; margin-left: 717px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #FFFFFF; line-height: 1.2; pointer-events: all; white-space: nowrap; "><font face="sans-serif"><span>Interquartile range</span></font></div></div></div></foreignObject><text x="717" y="497" fill="#FFFFFF" font-family="Helvetica" font-size="11px" text-anchor="middle">Interquartile range</text></switch></g></a><path d="M 625 519 Q 582.52 519 582.52 481.5 Q 582.52 444 540 444" fill="none" stroke="#1f6286" stroke-miterlimit="10" stroke-dasharray="1 2" pointer-events="stroke"/><rect x="625" y="509" width="184" height="20" rx="3" ry="3" fill="#000000" stroke="#000000" transform="translate(2,3)" opacity="0.25"/><rect x="625" y="509" width="184" height="20" rx="3" ry="3" fill="#878787" stroke="#000000" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" dir="ltr" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 519px; margin-left: 717px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #FFFFFF; line-height: 1.2; pointer-events: all; white-space: nowrap; "><font face="sans-serif"><a href="https://en.wikipedia.org/wiki/Percentile"><font color="#ffffff">Percentile</font></a><font> / </font><a href="https://en.wikipedia.org/wiki/Quantile"><font color="#ffffff">quantile</font></a></font></div></div></div></foreignObject><text x="717" y="522" fill="#FFFFFF" font-family="Helvetica" font-size="11px" text-anchor="middle">Percentile / quantile</text></switch></g><path d="M 625 544 Q 582.52 544 582.52 494 Q 582.52 444 540 444" fill="none" stroke="#1f6286" stroke-miterlimit="10" stroke-dasharray="1 2" pointer-events="stroke"/><a xlink:href="https://en.wikipedia.org/wiki/Mode_(statistics)"><rect x="625" y="534" width="184" height="20" rx="3" ry="3" fill="#000000" stroke="#000000" transform="translate(2,3)" opacity="0.25"/><rect x="625" y="534" width="184" height="20" rx="3" ry="3" fill="#878787" stroke="#000000" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; 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text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" dir="ltr" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 679px; margin-left: 206px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #FFFFFF; line-height: 1.2; pointer-events: all; white-space: nowrap; "><span style="font-size: 10px">Kernel Density Estimation (KDE)</span></div></div></div></foreignObject><text x="206" y="682" fill="#FFFFFF" font-family="Helvetica" font-size="11px" text-anchor="middle">Kernel Density Estimation (KDE)</text></switch></g></a><a xlink:href="https://en.wikipedia.org/wiki/P-value"><rect x="639.5" y="584" width="170" height="20" rx="3" ry="3" fill="#000000" stroke="#000000" transform="translate(2,3)" opacity="0.25"/><rect x="639.5" y="584" width="170" height="20" rx="3" ry="3" fill="#878787" stroke="#000000" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" dir="ltr" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 594px; margin-left: 725px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #FFFFFF; line-height: 1.2; pointer-events: all; white-space: nowrap; "><font face="sans-serif"><span>p-Value</span></font></div></div></div></foreignObject><text x="725" y="597" fill="#FFFFFF" font-family="Helvetica" font-size="11px" text-anchor="middle">p-Value</text></switch></g></a><path d="M 639.5 619 Q 589.76 619 589.76 606.5 Q 589.76 594 540 594" fill="none" stroke="#1f6286" stroke-miterlimit="10" stroke-dasharray="1 2" pointer-events="stroke"/><a xlink:href="https://en.wikipedia.org/wiki/Chi-squared_test"><rect x="639.5" y="609" width="170" height="20" rx="3" ry="3" fill="#000000" stroke="#000000" transform="translate(2,3)" opacity="0.25"/><rect x="639.5" y="609" width="170" height="20" rx="3" ry="3" fill="#878787" stroke="#000000" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; 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text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" dir="ltr" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 149px; margin-left: 750px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #FFFFFF; line-height: 1.2; pointer-events: all; white-space: nowrap; ">Exponential</div></div></div></foreignObject><text x="750" y="152" fill="#FFFFFF" font-family="Helvetica" font-size="11px" text-anchor="middle">Exponential</text></switch></g></a><path d="M 689.5 174 Q 585 174 585 259.5 Q 585 345 540 344" fill="none" stroke="#1f6286" stroke-miterlimit="10" stroke-dasharray="1 2" pointer-events="stroke"/><a xlink:href="https://en.wikipedia.org/wiki/Discrete_uniform_distribution"><rect x="689.5" y="210" width="120" height="20" rx="3" ry="3" fill="#000000" stroke="#000000" pointer-events="all" transform="translate(2,3)" opacity="0.25"/><rect x="689.5" y="210" width="120" height="20" rx="3" ry="3" fill="#878787" stroke="#000000" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" dir="ltr" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 220px; margin-left: 750px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #FFFFFF; line-height: 1.2; pointer-events: all; white-space: nowrap; "><font face="sans-serif">Uniform (discrete)</font></div></div></div></foreignObject><text x="750" y="223" fill="#FFFFFF" font-family="Helvetica" font-size="11px" text-anchor="middle">Uniform (discrete)</text></switch></g></a><path d="M 540 394 Q 614.8 394 614.8 307 Q 614.8 220 689.5 220" fill="none" stroke="#1f6286" stroke-miterlimit="10" stroke-dasharray="1 2" pointer-events="stroke"/><a xlink:href="https://support.minitab.com/en-us/minitab-express/1/help-and-how-to/basic-statistics/probability-distributions/supporting-topics/basics/continuous-and-discrete-probability-distributions/#what-is-a-discrete-distribution"><rect x="370" y="379" width="170" height="30" rx="4.5" ry="4.5" fill="#000000" stroke="#000000" pointer-events="all" transform="translate(2,3)" opacity="0.25"/><rect x="370" y="379" width="170" height="30" rx="4.5" ry="4.5" fill="#1f6286" stroke="#000000" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" dir="ltr" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 394px; margin-left: 455px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: #FFFFFF; line-height: 1.2; pointer-events: all; white-space: nowrap; ">Discrete distributions (pmf's)</div></div></div></foreignObject><text x="455" y="398" fill="#FFFFFF" font-family="Helvetica" font-size="12px" text-anchor="middle">Discrete distributions (pmf'...</text></switch></g></a><a xlink:href="https://en.wikipedia.org/wiki/Chi-squared_distribution"><rect x="689.5" y="164" width="120" height="20" rx="3" ry="3" fill="#000000" stroke="#000000" pointer-events="all" transform="translate(2,3)" opacity="0.25"/><rect x="689.5" y="164" width="120" height="20" rx="3" ry="3" fill="#878787" stroke="#000000" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; 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text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" dir="ltr" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 321px; margin-left: 750px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #FFFFFF; line-height: 1.2; pointer-events: all; white-space: nowrap; "><font face="sans-serif">Poisson</font></div></div></div></foreignObject><text x="750" y="324" fill="#FFFFFF" font-family="Helvetica" font-size="11px" text-anchor="middle">Poisson</text></switch></g></a><rect x="625" y="384" width="184" height="20" rx="3" ry="3" fill="#000000" stroke="#000000" pointer-events="all" transform="translate(2,3)" opacity="0.25"/><rect x="625" y="384" width="184" height="20" rx="3" ry="3" fill="#878787" stroke="#000000" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" dir="ltr" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 394px; margin-left: 717px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #FFFFFF; line-height: 1.2; pointer-events: all; white-space: nowrap; "><font face="sans-serif"><a href="https://en.wikipedia.org/wiki/Expected_value"><font color="#ffffff">Expectation</font></a><font> and </font><a href="https://en.wikipedia.org/wiki/Mean"><font color="#ffffff">mean</font></a></font></div></div></div></foreignObject><text x="717" y="397" fill="#FFFFFF" font-family="Helvetica" font-size="11px" text-anchor="middle">Expectation and mean</text></switch></g><rect x="370" y="479" width="170" height="30" rx="4.5" ry="4.5" fill="#1f6286" stroke="#000000" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" dir="ltr" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 494px; margin-left: 455px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: #FFFFFF; line-height: 1.2; pointer-events: all; white-space: nowrap; ">Important Laws</div></div></div></foreignObject><text x="455" y="498" fill="#FFFFFF" font-family="Helvetica" font-size="12px" text-anchor="middle">Important Laws</text></switch></g><path d="M 540 444 Q 582.5 444 582.5 419 Q 582.5 394 625 394" fill="none" stroke="#1f6286" stroke-miterlimit="10" stroke-dasharray="1 2" pointer-events="stroke"/><rect x="370" y="429" width="170" height="30" rx="4.5" ry="4.5" fill="#000000" stroke="#000000" pointer-events="all" transform="translate(2,3)" opacity="0.25"/><rect x="370" y="429" width="170" height="30" rx="4.5" ry="4.5" fill="#1f6286" stroke="#000000" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" dir="ltr" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 444px; margin-left: 455px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: #FFFFFF; line-height: 1.2; pointer-events: all; white-space: nowrap; ">Summary statistics</div></div></div></foreignObject><text x="455" y="448" fill="#FFFFFF" font-family="Helvetica" font-size="12px" text-anchor="middle">Summary statistics</text></switch></g><path d="M 370 544 Q 370 550 357.5 550 Q 345 550 345 599.5 Q 345 649 298 649" fill="none" stroke="#1f6286" stroke-miterlimit="10" stroke-dasharray="1 2" pointer-events="stroke"/><path d="M 370 544 Q 370 550 357.5 550 Q 345 550 345 614.5 Q 345 679 298 679" fill="none" stroke="#1f6286" stroke-miterlimit="10" stroke-dasharray="1 2" pointer-events="stroke"/><a xlink:href="https://en.wikipedia.org/wiki/Estimation_theory"><rect x="370" y="529" width="170" height="30" rx="4.5" ry="4.5" fill="#000000" stroke="#000000" pointer-events="all" transform="translate(2,3)" opacity="0.25"/><rect x="370" y="529" width="170" height="30" rx="4.5" ry="4.5" fill="#1f6286" stroke="#000000" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" dir="ltr" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 544px; margin-left: 455px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: #FFFFFF; line-height: 1.2; pointer-events: all; white-space: nowrap; ">Estimation</div></div></div></foreignObject><text x="455" y="548" fill="#FFFFFF" font-family="Helvetica" font-size="12px" text-anchor="middle">Estimation</text></switch></g></a><path d="M 540 594 Q 540 594 639.5 594" fill="none" stroke="#1f6286" stroke-miterlimit="10" stroke-dasharray="1 2" pointer-events="stroke"/><a xlink:href="https://en.wikipedia.org/wiki/Statistical_hypothesis_testing"><rect x="370" y="579" width="170" height="30" rx="4.5" ry="4.5" fill="#000000" stroke="#000000" pointer-events="all" transform="translate(2,3)" opacity="0.25"/><rect x="370" y="579" width="170" height="30" rx="4.5" ry="4.5" fill="#1f6286" stroke="#000000" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" dir="ltr" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 594px; margin-left: 455px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: #FFFFFF; line-height: 1.2; pointer-events: all; white-space: nowrap; ">Hypothesis Testing</div></div></div></foreignObject><text x="455" y="598" fill="#FFFFFF" font-family="Helvetica" font-size="12px" text-anchor="middle">Hypothesis Testing</text></switch></g></a><a xlink:href="https://en.wikipedia.org/wiki/Confidence_interval"><rect x="370" y="629" width="170" height="30" rx="4.5" ry="4.5" fill="#000000" stroke="#000000" pointer-events="all" transform="translate(2,3)" opacity="0.25"/><rect x="370" y="629" width="170" height="30" rx="4.5" ry="4.5" fill="#1f6286" stroke="#000000" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; 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diff --git a/images/intro.xml b/images/intro.xml
index ca79150..18dc1d0 100644
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