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

question 25

Multiple Choice

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 probability that the clerk spends 4 to 5 minutes with a randomly selected customer?

• A) 0.7135
• B) 0.6321
• C) 0.3456
• D) 0.0814

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