A communications systems salesperson contacts four businesses during a week. Each contact can result in either a

Question:

A communications systems salesperson contacts four businesses during a week. Each contact can result in either a sale, with probability .3, or no sale, with probability .7. Assume that the results for customer contacts are independent.
(a) List the elementary outcomes and assign probabilities.
(b) If X denotes the number of communications systems sold during the week, obtain the probability of X.
(c) Calculate the expected value of X. Distribution
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