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Bob Nale is the owner of Nale's Quick Fill. Bob would like to estimate the mean...

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Statistics

Bob Nale is the owner of Nale's Quick Fill. Bob would like toestimate the mean number of gallons of gasoline sold to hiscustomers. Assume the number of gallons sold follows the normaldistribution with a population standard deviation of 2.2 gallons.From his records, he selects a random sample of 56 sales and findsthe mean number of gallons sold is 8.07. (Round youranswers to 2 decimal places.)

(a)The point estimate of the population mean is
(b)

The 99 percent confidence interval for the population mean isbetween  and .

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