SOLUTION: Find the standard deviation of the data set to the nearest tenth. 21,13,18,16,13,35,12,8,15 I know the mean is 16.8 and the sum of the data is 151 but I could get no further

Algebra ->  Customizable Word Problem Solvers  -> Misc -> SOLUTION: Find the standard deviation of the data set to the nearest tenth. 21,13,18,16,13,35,12,8,15 I know the mean is 16.8 and the sum of the data is 151 but I could get no further      Log On

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Question 98314: Find the standard deviation of the data set to the nearest tenth.
21,13,18,16,13,35,12,8,15
I know the mean is 16.8
and the sum of the data is 151 but I could get no further than that. Sorry.
Thank you.
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
find the difference between each number and the mean (subtract the mean from each number)

square each difference ... add the squares together ... divide by the number of squares (9 in this case) ... take the square root of the result

this is the standard deviation