anonymous
  • anonymous
what is the standard deviation of the data set 11,20,31,48
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
hello?
welshfella
  • welshfella
Find 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
anonymous
  • anonymous
thx

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welshfella
  • welshfella
|dw:1440612951005:dw|
welshfella
  • welshfella
the sigma refers to the top of the fraction
anonymous
  • anonymous
k so the answer is 9
anonymous
  • anonymous
????????
mathmate
  • mathmate
The answer is not 9. :( What did you get for the mean?
welshfella
  • welshfella
i didn't get 9 eeither
mathmate
  • mathmate
Also, 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 "n-1" instead of "n".

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