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(a) Suppose the time that a customer spends in a store is uniformly distributed between 5 and 15 minutes. What is the variance in the

(a) Suppose the time that a customer spends in a store is uniformly distributed between 5 and 15 minutes. What is the variance in the amount of time that a customer spends in the store?

(b) If 4 customers arrive per hour, what is the probability that the store owner will wait for more than 10 minutes for a customer to arrive?

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