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Exercise 10. Suppose that the length of long-distance phone calls, measured in minutes, is known to have an exponential distribution with the average length of

Exercise 10.

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.

a. Define the random variable. X =___________________.

b. Is X continuous or discrete?

c. X ~_______

d.m =_______

e.s =_______

Solution

a. X =

b. X is

c. X ~_______

d.m =_______

e.s =_______

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