Precalculus Enhanced with Graphing Utilities (7th Edition)
Precalculus Enhanced with Graphing Utilities (7th Edition)
7th Edition
ISBN: 9780134119281
Author: Michael Sullivan, Michael Sullivan III
Publisher: PEARSON
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Chapter 5.4, Problem 124AE

Exponential Probability Between 5:00 PM and 6:00 PM, cars arrive at Jiffy Lube at the rate of 9 cars per hour ( 0.15 car per minute). The following formula from statistics can be used to determine the probability that a car will arrive within t minutes of 5:00 PM.

F ( t )   =   1     e 0.15 t

a. Determine how many minutes are needed for the probability to reach 50 % .

b. Determine how many minutes are needed for the probability to reach 80 % .

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