Bob Nale is the owner of Nales Texaco GasTown Bob would like

Bob Nale is the owner of Nales Texaco GasTown. Bob would like to estimate the mean number of gallons of gasoline sold to his customers. Assume the number of gallons sold follows the normal distribution with a standard deviation of 2.50 gallons. From his records, he selects a random sample of 55 sales and finds the mean number of gallons sold is 5.40. (Round your answers to 2 decimal places.)
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(a) The point estimate of the population mean is ?

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(b) determine a 90%confidence interval for the population mean

Confidence interval ...and...

Bob Nale is the owner of Nales Texaco GasTown. Bob would like to estimate the mean number of gallons of gasoline sold to his customers. Assume the number of gallons sold follows the normal distribution with a standard deviation of 2.50 gallons. From his records, he selects a random sample of 55 sales and finds the mean number of gallons sold is 5.40. (Round your answers to 2 decimal places.)
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(a) The point estimate of the population mean is ?

---------------------------------------
(b) determine a 90%confidence interval for the population mean

Confidence interval ...and...

Bob Nale is the owner of Nales Texaco GasTown. Bob would like to estimate the mean number of gallons of gasoline sold to his customers. Assume the number of gallons sold follows the normal distribution with a standard deviation of 2.50 gallons. From his records, he selects a random sample of 55 sales and finds the mean number of gallons sold is 5.40. (Round your answers to 2 decimal places.)
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(a) The point estimate of the population mean is ?

---------------------------------------
(b) determine a 90%confidence interval for the population mean

Confidence interval ...and...

Solution