What is the 86.9% confidence interval for m


A random sample of 81 automobiles traveling on a section of an interstate showed an average speed of 60 mph. The distribution of speeds of all cars on this section of highway is normally distributed, with a standard deviation of 13.5 mph. what is the 86.9% confidence interval for m ?

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Basic Statistics: What is the 86.9% confidence interval for m
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