Question: 1. A simple random sample of three items is selected from a shipment of 20 items of which four are defective. Let X be the

1. A simple random sample of three items is selected from a shipment of 20 items of which four are defective.

Let X be the number of defective items in the sample.

(a) Find the PMF of X.

(b) Find the mean value and variance of X.

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