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The mean lifetime expected from a model of car follows a normal distribution with a standard deviation of 9500 km. A sample of 100 cars

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The mean lifetime expected from a model of car follows a normal distribution with a standard deviation of 9500 km. A sample of 100 cars showed a mean lifetime of 190 000 km. a) Determine the margin of error (rounded to one decimal place, if necessary) at a 99% confidence level. Using your answer from part a), determine the 99% confidence interval for the mear

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