A. Show that the area under the curve is 1.00?

B. How long does the typical patron wait for elevator service?

C. What is the standard deviation of the waiting time?

D. What percent of the patrons wait for less than a minute?

E. What percent of the patrons wait for more than 2 minute?

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## This question was asked on Jan 24, 2013 and answered on Jan 25, 2013.

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