A sign on the pumps at a gas station encourages customers to have their oil checked, and claims that 1 out of 5 cars needs to have oil added. If this is true (and assuming cars arriving independently), find the probability that at most 21 out of the next 84 cars needs oil.

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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A sign on the pumps at a gas station encourages customers to have their oil checked, and claims that
have oil added. If this is true (and assuming cars arriving independently), find the probability that at most 21 out of the next
out of 5 cars needs to
84 cars needs oil.
Transcribed Image Text:A sign on the pumps at a gas station encourages customers to have their oil checked, and claims that have oil added. If this is true (and assuming cars arriving independently), find the probability that at most 21 out of the next out of 5 cars needs to 84 cars needs oil.
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