Finished section 2 and section 3

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diff --git a/report/figures/tracy-widom-approx/pdf_stats.m b/report/figures/tracy-widom-approx/pdf_stats.m
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+function [skew, kurtosis] = pdf_stats(x,p)
+
+    % Define some useful bits
+    dx = x(2) - x(1);
+
+    % The expected value (From LibreTexts 4.1)
+    E = @(x) sum(x .* p) * dx;
+
+    % First moment (mean) (From LibreTexts 4.3)
+    mu = E(x)
+    
+    % Second moment (variance) (From LibreTexts 4.3)
+    sigma = sqrt(E((x - mu).^2))
+
+    % Third moment (skewness) (From LibreTexts 4.4)
+    skew = E(((x - mu)/sigma).^3)
+
+    % Fourth moment (excess kurtosis) (From LibreTexts 4.4)
+    kurtosis = E(((x - mu)/sigma).^4) - 3
+
+end