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’s the probability that a person waits between 3 and 5 min? (b) What’s the probability that the waiting time to be served exceeds the mean wait time by more than 2 standard deviations? (c)  What is the probability that a person is served in less than 3 minutes on at least 5 of the next 6 days?

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Q: According to an almanac, 60% of adult smokers started smoking before turning 18 years old. (a)…

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