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The random variable X is the number of minutes of serving a customer in a Starbucks...

The random variable X is the number of minutes of serving a customer in a Starbucks coffee shop. Assume that X has an exponential distribution with the mean equals to 5 minutes.

a) What is the standard deviation of the serving time?

b) What is the probability that the serving time for a customer will be between 3 and 5 minutes?

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Answer #1

xn exponential (x) f(x)=x etx P(x>x) - é de P(xxx): eta I-ě u=5, M = 1 5 . d = 0.2 a) o 1 v 05 11 b) P(32x25) = P(x<5) - P(x4

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