A company advertises that the batteries it sells is normally distributed with a mean life of 25 hours with a standard deviation of 3 hours. Let the random variable X represent battery life hours. What is the probability, rounded to 4 decimal places, that a randomly selected battery sold by this company lasts a. less than 21 hours? b. between 25 and 27 hours?

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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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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company advertises that the batteries it sells is normally distributed with a mean life of 25 hours with a
standard deviation of 3 hours. Let the random variable X represent battery life hours. What is the probability,
rounded to 4 decimal places, that a randomly selected battery sold by this company lasts
a. less than 21 hours?
b. between 25 and 27 hours?
Transcribed Image Text:A company advertises that the batteries it sells is normally distributed with a mean life of 25 hours with a standard deviation of 3 hours. Let the random variable X represent battery life hours. What is the probability, rounded to 4 decimal places, that a randomly selected battery sold by this company lasts a. less than 21 hours? b. between 25 and 27 hours?
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