Return to the situation described in Exercise 3. a. Determine the marginal pmf of X, and then

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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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