Question
3.74 The time Z in minutes between calls to an elec-trical supply system has the probability density func-tion f(z)=\left\{\begin{array}{ll} \frac{1}{10} e^{-a / 10}, & 0<z<\infty \\ 0, & \text { elsewhere. } \end{array}\right. (a) What is the probability that there are no calls withina 20-minute time interval? (b) Wh
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