Bob Nale is the owner of Nale's Quick Fill. 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 population standard deviation of 1.90 gallons. From his records, he selects a random sample of 80 sales and finds the mean number of gallons sold is 7.00. a. What is the point estimate of the population mean? (Round your answer to 2 decimal places.) Point estimate b. Determine a 99% confidence interval for the population mean. (Use z Distribution Table.) (Round your answers to 2 decimal places.)

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Bob Nale is the owner of Nale's Quick Fill. 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 population standard deviation of 1.90 gallons. From his
records, he selects a random sample of 80 sales and finds the mean number of gallons
sold is 7.00.
a.
What is the point estimate of the population mean? (Round your answer to 2 decimal
places.)
Point estimate
b. Determine a 99% confidence interval for the population mean. (Use z Distribution
Table.) (Round your answers to 2 decimal places.)
Confidence
interval
and
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Transcribed Image Text:Bob Nale is the owner of Nale's Quick Fill. 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 population standard deviation of 1.90 gallons. From his records, he selects a random sample of 80 sales and finds the mean number of gallons sold is 7.00. a. What is the point estimate of the population mean? (Round your answer to 2 decimal places.) Point estimate b. Determine a 99% confidence interval for the population mean. (Use z Distribution Table.) (Round your answers to 2 decimal places.) Confidence interval and Prev 1 of 6 waw www Next >
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