the length of time for one individual to be served at a cafeteria is a random variable having an exponential

the length of time for one individual to be served at a cafeteria is a random variable having an exponential distribution with a mean of 4 minutes.
a. What is the probability that a person is served in 3 minutes or less?
b. What is the probability that a person is served in 3 minutes or less on at least 4 of the next 6 days?
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