The average number of miles (in thousands) that a car's tire will function before needing replacement is 72 and the stan

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The Average Number Of Miles In Thousands That A Car S Tire Will Function Before Needing Replacement Is 72 And The Stan 1 (28.58 KiB) Viewed 57 times

The average number of miles (in thousands) that a car's tire will function before needing replacement is 72 and the standard deviation is 20. Suppose that 42 randomly selected tires are tested. Round all answers to 4 decimal places where possible and assume a normal distribution. a. What is the distribution of X? X - N b. What is the distribution of ? - N c. If a randomly selected individual tire is tested, find the probability that the number of miles (in thousands) before it will need replacement is between 72.2 and 76.2. d. For the 42 tires tested, find the probability that the average miles (in thousands) before need of replacement is between 72.2 and 76.2. e. For part d), is the assumption that the distribution is normal necessary? No Yes