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Card 7 / 25:
Suppose that the length of long distance phone calls, measured in minutes, is known to have an exponential distribution with the average length of a call equal to eight minutes.
Define the random variable. X = ________________.Is X continuous or discrete?X ~ ________μ = ________σ = ________Draw a graph of the probability distribution. Label the axes.Find the probability that a phone call lasts less than nine minutes.Find the probability that a phone call lasts more than nine minutes.Find the probability that a phone call lasts between seven and nine minutes.If 25 phone calls are made one after another, on average, what would you expect the total to be? Why?
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