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Data & Analytics · Foundational

Probability Distribution

A function describing the likelihood of each possible value of a random variable.

Definition

Discrete distributions (binomial, Poisson) use probability mass functions; continuous distributions (normal, uniform, exponential, t) use density functions. Cumulative distribution functions give P(X ≤ x).

Exam tip

Discrete = countable outcomes (PMF); continuous = measurable outcomes (PDF).

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