Quant interviewers ask which distribution fits a real situation (option payoffs, queue arrivals, default counts) before they ask you to derive its moments. Drag the parameters here until the PDF and CDF shapes are wired into your intuition.
Drag the sliders. Watch the PDF and CDF respond. Click any tile to switch distributions. Each one links to its full tutorial.
The CLT limit. The workhorse for sums and averages of independent quantities.
PDF — how likely each value is
CDF — probability of getting ≤ x
Bug, wording issue, or polish suggestion — all go straight into the dogfood backlog.