The usage time of a telephone belonging to a specific brand may be looked upon as a random variable having normal distribution with a mean of 20 years and a variance 4 years. What is the probability that a randomly selected telephone will be used between 15 and 18 years?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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The usage time of a telephone belonging to a specific brand may be looked upon as a random variable
having normal distribution with a mean of 20 years and a variance 4 years. What is the probability that
a randomly selected telephone will be used between 15 and 18 years?
Transcribed Image Text:The usage time of a telephone belonging to a specific brand may be looked upon as a random variable having normal distribution with a mean of 20 years and a variance 4 years. What is the probability that a randomly selected telephone will be used between 15 and 18 years?
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