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In a batch of 25 pedometers, 3 are believed to be defective. A quality-control engineer...

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Calculus

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In a batch of 25 pedometers, 3 are believed to be defective. A quality-control engineer randomly selects 5 units to test. Let random variable X = the number of defective units that are among the 5 units tested.a. Find the probability mass function f(x) = P(X=x), and sketch its histogram.b. Find P(X= 1). What does this number represent?c. Find P(X? 1). What does this number represent?

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