The lifetime of a certain type of automobile tire (in thousands of miles) is normally distributed with a mean of 39 and a standard deviation of 3.5. Find the following probabilities, round to the fourth. a) What is the probability 18 randomly chosen tires have an average lifetime greater than 38 0.8873 Would it be unusual or usual for this to happen? usual b) What is the probability 11 randomly chosen tires have a lifetime less than 32 Would it be unusual or usual for this to happen? unusual

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 lifetime of a certain type of automobile tire (in thousands of miles) is normally distributed with a mean
of 39 and a standard deviation of 3.5. Find the following probabilities, round to the fourth.
a) What is the probability 18 randomly chosen tires have an average lifetime greater than 38
0.8873
Would it be unusual or usual for this to happen?
usual
b) What is the probability 11 randomly chosen tires have a lifetime less than 32
Would it be unusual or usual for this to happen?
unusual
Transcribed Image Text:The lifetime of a certain type of automobile tire (in thousands of miles) is normally distributed with a mean of 39 and a standard deviation of 3.5. Find the following probabilities, round to the fourth. a) What is the probability 18 randomly chosen tires have an average lifetime greater than 38 0.8873 Would it be unusual or usual for this to happen? usual b) What is the probability 11 randomly chosen tires have a lifetime less than 32 Would it be unusual or usual for this to happen? unusual
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