Question: Return to the situation described in Exercise 3. a. Determine the marginal pmf of X, and then calculate the expected number of customers in line

Return to the situation described in Exercise 3.

a. Determine the marginal pmf of X, and then calculate the expected number of customers in line at the express checkout.

b. Determine the marginal pmf of X.

c. By inspection of the probabilities P(X = 4), P(X = 0), and P(X = 4, X=0), are X, and X, independent random variables? Explain.

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