Find probability that time between calls exceeds mean


The density function of the time Z in minutes between calls to an electrical supply store is given by

f(z)= {1/10e-z , 0

        {0,        elsewhere.

(a) What is the mean time between calls?

(b) What is the variance in the time between calls?

(c) What is the probability that the time between calls exceeds the mean?

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Basic Statistics: Find probability that time between calls exceeds mean
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