The answers you have are correct.
Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance.
Standard deviation = square root of variance
I'll let you do the calculations.
The monthly rents for the apartments in a building are listed below. $425, $550, $550, $550, $650, $650, $650, $650, $800, $900
Part A: Find the mean$637.50 median=$650 mode=$650 range=$475 and standard deviation of the rents???
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