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. Find the following probabilities, round to the fourth. a) What is the probability 15 randomly chosen tires have an average lifetime greater than 38 Would it be unusual or usual for this to happen? Select an answer b) What is the probability 21 randomly chosen tires have a lifetime less than 32 Would it be unusual or usual for this to happen? Select an answer
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. Find the following probabilities, round to the fourth. a) What is the probability 15 randomly chosen tires have an average lifetime greater than 38 Would it be unusual or usual for this to happen? Select an answer b) What is the probability 21 randomly chosen tires have a lifetime less than 32 Would it be unusual or usual for this to happen? Select an answer
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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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. Find the
following probabilities, round to the fourth.
a) What is the probability 15 randomly chosen tires have an average lifetime
greater than 38
Would it be unusual or usual for this to happen?
Select an answer
b) What is the probability 21 randomly chosen tires have a lifetime less than 32
Would it be unusual or usual for this to happen?
Select an answer
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