Consider a random variable X that is equal to 1, 2, or 3. If we know that

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Consider a random variable X that is equal to 1, 2, or 3. If we know that

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then it follows (since p(1) + p(2) + p(3) = 1) that image text in transcribed

A graph of p(x) is presented in Figure 4.1. ■
The cumulative distribution function F can be expressed in terms of p(x) by

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