Let ? be the amount of time (in minutes) a postal clerk spends with his or her customer. The time is known to have an exponential distribution with the average amount of time equal to four minutes. i) Find the probability that a clerk spends four to five minutes with a randomly selected customer. ii) Find the probability that a clerk spends at least five minutes with a randomly selected customer

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Let ? be the amount of time (in minutes) a postal clerk spends with his or her
customer. The time is known to have an exponential distribution with the average amount of time
equal to four minutes.
i) Find the probability that a clerk spends four to five minutes with a randomly selected customer.
ii) Find the probability that a clerk spends at least five minutes with a randomly selected customer.

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