Question

Asked Oct 7, 2019

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Step 1

Given data

Mean = 68

Standard deviation = 12

As per binomial approximation

Mean = np > 5 and standard deviation = npq > 5

So it will follow normal distribution

a) The distribution of x is Normal i.e. X ~ N(68,12^{2})

b) The distribution of x-bar is

Step 2

c)

If the randomly selected individual tire is tested, probability that the number of miles before it will need replacement is between 64.8 and 71.7 is given by

Step 3

d)

For the 6 tires tested, probability that the average miles before...

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