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Author Question: The time between arrivals of customers at the drive-up window of a bank follows an exponential ... (Read 83 times)

mwit1967

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on: Jun 24, 2018
The time between arrivals of customers at the drive-up window of a bank follows an exponential probability distribution with a mean of 10 minutes.
 a. What is the probability that the arrival time between customers will be 7 minutes or less?
  b. What is the probability that the arrival time between customers will be between 3 and 7 minutes?

Question 2

A researcher is interested in determining the average number of years employees of a company stay with the company. If past information shows a standard deviation of 7 months, what size sample should be selected so that at 95 confidence the margin of error will be 2 months or less?


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janieazgirl

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Reply #1 on: Jun 24, 2018
Answer to Question 1

a. .5034
b. .2442

Answer to Question 2

48


mwit1967

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Reply 2 on: Jun 24, 2018
YES! Correct, THANKS for helping me on my review

xiaomengxian

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Reply 3 on: Yesterday
Wow, this really help

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