Let X = the time (in minutes) that a postal clerk spends with her customers.This time is known to have an exponential distribution with an average of 4 minutes.What is the parameter λ for this random variable?
A) 4
B) 2
C) 0.5
D) 0.25

Question

Quizplus · Accepted Answer

The parameter λ of an exponential distribution is the reciprocal of the mean. Since the mean is 4 minutes, λ = 1/4 = 0.25.

Let X = the Time (In Minutes) That a Postal