Question
The time between incoming phone calls at a call center is a random variable with exponential density. There is a 50$\%$ probability of waiting 20 seconds or more between calls. What is the average time between calls?
Step 1
The probability density function of an exponential distribution is given by $f(t) = \frac{1}{r} e^{-t/r}$, where $r$ is the average waiting time between two calls. Show more…
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