Mathematical Methods · discrete RVs · manipulative

A discrete RV models an experiment

Pick a die, spinner, or coin. Outcomes get listed; stick heights are probabilities — always summing to 1.

P(X = x) Σp = 1
Experiment
Fair six-sided die

Outcomes of X

Probability mass function

Σp = 1 Always a valid pmf — editing one stick renormalises the rest.

Experiment preset

Drag a stick top, or scrub below. Heights stay probabilities.

Probabilities pᵢ

Working