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Compute the sample mean and standard deviation

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Reference no: EM132844713

Following a sample of the incomes (in thousands of dollars) of eight U.S. residents selected at random 50, 40, 60, 20, 90, 10, 30, 20

i) Compute the sample mean and standard deviation, rounded to one decimal place.

ii) What percentage of the scores fall within one standard deviation of the mean?

iii) What percentage of the scores fall within two standard deviation of the mean?

Reference no: EM132844713

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