In a batch of 25 pedometers, 3 are believed to be defective.

Last updated: 8/10/2022

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?