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anonymous
 one year ago
what is the standard deviation of the data set 11,20,31,48
anonymous
 one year ago
what is the standard deviation of the data set 11,20,31,48

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welshfella
 one year ago
Best ResponseYou've already chosen the best response.1Find the mean mu then work out the differences between the 4 numbers and the mean. SQuare these values then find their sum and divide by the number of values which is 4 in this case. Finally take the square root of the last result

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1dw:1440612951005:dw

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1the sigma refers to the top of the fraction

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0k so the answer is 9

mathmate
 one year ago
Best ResponseYou've already chosen the best response.0The answer is not 9. :( What did you get for the mean?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1i didn't get 9 eeither

mathmate
 one year ago
Best ResponseYou've already chosen the best response.0Also, note that if the data set is a sample of a population (i.e. not the complete population), then the sample variance is divided by "n1" instead of "n".
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