Question

6. Jonh Bale is the owner of Bale’s Quick Fill. Jonh 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 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.

Within what limits will 90 percent of the sample mean occur? (Round your answers to 2 decimal places.)

Sample means …............. and …...............

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