Question: The manager of a store buys weather radios in lots of 48. Suppose that, on the average, 4 out of each group of 48 are

The manager of a store buys weather radios in lots of 48. Suppose that, on the average, 4 out of each group of 48 are defective. The manager randomly selects 4 radios out of the group to test.
(a) What is the probability that he will find 2 defective radios?
(b) What is the probability that he will find no defective radios?

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