Question: Consider now Review Exercise 3.74 on page 128. The density function of the time Z in minutes between calls to an electrical supply store is

Consider now Review Exercise 3.74 on page 128. The density function of the time Z in minutes between calls to an electrical supply store is given by 1. What is the mean time between calls?

2. What is the variance in the time between calls?

3. What is the probability that the time between calls exceeds the mean?

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