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What is the mean time between telephone calls

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The time T(in minutes) between telephone calls at an office has the following probability density function: f(t) = 0.25e-0.25t, t ≥ 0.

(a) What is the mean time between telephone calls?

(b) What is the probability of having 2 or more minutes between telephone calls?

Reference no: EM131712800

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