If 20% of the residents in a US city prefer a white telephone over any other color available, what is the probability that among the next 1000 telephones installed in that city a.Between 170 and 185 inclusive will be white? b.At least 210 but not more than 225 will be white?

College Algebra
10th Edition
ISBN:9781337282291
Author:Ron Larson
Publisher:Ron Larson
Chapter8: Sequences, Series,and Probability
Section8.7: Probability
Problem 11ECP: A manufacturer has determined that a machine averages one faulty unit for every 500 it produces....
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If 20% of the residents in a US city prefer a white telephone over any other color available, what is the probability that among the next 1000 telephones installed in that city

a.Between 170 and 185 inclusive will be white?

b.At least 210 but not more than 225 will be white?

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