The mean prepartion fee hampr blocked charged retail

Reference no: EM13602163

The mean prepartion fee H&R blocked charged retail customers last year was $183 (The wall street Journal, March 7,2012.) Use this price as the population mean and assume the populations standard deviation of prepartion fee is $50.

A) what is the probability that them mean price for a sample of 30 H&R block retail customers is within $8 of the population mean?

B) what is the proability that the mean price for a sample of 50 H&R block retail customers is within $8 of the population mean?

C) what is the proability that the mean price for a sample of 100 H&R block retail customers is within $8 of the population mean?

D) Which if any of the sample sizes in parts a, b, c would you recommend to have at least .95 probability that the sample mean is within $8 of the population mean?

Reference no: EM13602163

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