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The mean preparation fee H&R Block charged reil customers last year was $183, the wall street journal, march 7, 2012. use this price as the population mean and assume the population standard deviation of preparation fees is $50.
a. What is the probability that the mean price for a sample of 30 H&R Block retail customers is within $8.00 of population means.
Standard deviation is a measure of variability so lower standard deviation means more consistency. In statistics, the symbol for population standard deviation is the Greek lowercase letter sigma
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