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What is the variance in the time between calls what is the

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Reference no: EM13580772

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<z<∞,

        {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?

Reference no: EM13580772

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