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Suppose we have a pile of 20 batteries of which ve are dead

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Suppose we have a pile of 20 batteries, of which ?ve are dead. If we select 4 batteries at random, let X be the random variable measuring the number of dead batteries in the four we select.

(a) Find the probability mass function p(x).

(b) Find the expected value E(X).

(c) Find the variance V(X).

Reference no: EM13611609

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