Homework Help Forum: Math-Answer included

Posted by Anonymous on Friday, November 6, 2009 at 3:14pm.

{9, 7, 13, 24, 32, 45, 47} First you have to find the mean The mean is 9+7+13+24+32+45+47=177/7=25.2857=25.29 Find the standard deviation for the given data. Round your answer to one more decimal place than the original data. {9, 7, 13, 24, 32, 45, 47} (25.29-9)^2=16.29^2=265.36 (25.29-7)^2=18.29^2=334.52 (25.29-13)^2=12.29^2=151.04 (25.29-24)^2=1.29^2=1.66 (25.29-45)^2= -19.71^2=388.48 (25.29-47)^2= -21.41^2=458.39 1599.45 Sqrt 39.99 My answer isn't matching the possible choices

• Math-Answer included - bobpursley, Friday, November 6, 2009 at 3:23pm

  your mean is correct. (25.29-9)^2=16.29^2=265.36 (25.29-7)^2=18.29^2=334.52 (25.29-13)^2=12.29^2=151.04 (25.29-24)^2=1.29^2=1.66 (25.29-45)^2= -19.71^2=388.48 (25.29-47)^2= -21.41^2=458.39 Your second moment about the mean is correct. Now, standard deviation. I would divide that sum by n=7 (or in real life, n-1) then take the square root. I get about 16 http://hubpages.com/hub/deviation

  
  

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