# Question

In the Ardmore Hotel, 20 percent of the guests (the historical percentage) pay by American Express credit card.

(a) What is the expected number of guests until the next one pays by American Express credit card?

(b) What is the probability that the first guest to use an American Express is within the first 10 to checkout?

(a) What is the expected number of guests until the next one pays by American Express credit card?

(b) What is the probability that the first guest to use an American Express is within the first 10 to checkout?

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