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# a nationwide (u.s) donut chain determined that its stores sells an average of 256 donuts per day with a standard deviation of 36 donuts.

a nationwide (u.s) donut chain determined that its stores sells an average of 256 donuts per day with a standard deviation of 36 donuts. If a sample of 16 stores results in a sample of 249 donuts what is the standard error of the mean?