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7. More than 50 million guests stay at bed and breakfast (B&Bs) each year. The website for the Bed and Breakfast Inns of North America, which averages seven visitors per minute, enables many B&Bs to attract guests. (a) Compute the probability of no website visitors in a one-minute period. (b) Compute the probability of two or more website visitors in a one-minute period. (c) Compute the expected number of website visitors in a one-minute period. (d) Compute the variance of the number of website visitors in a one-minute period.

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