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Probability Distribution of Discrete Random Variables - Cumulative Distribution Function (c. d. f. )

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Maharashtra State Board: Class 12

Definition: Cumulative Distribution Function (c. d. f. )

If (X) is a continuous random variable with the pmf f(x), then its cumulative distribution function, or simply distribution function F(x), is defined as

\[F(x)=P(X\leq x)=\sum_{x_{i}\leq x}P[X=x_{i}]=\sum_{x_{i}\leq x}f(x_{i})\]

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