what is the standard deviation of the data set 11,20,31,48

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what is the standard deviation of the data set 11,20,31,48

Mathematics
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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
thx

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Other answers:

|dw:1440612951005:dw|
the sigma refers to the top of the fraction
k so the answer is 9
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The answer is not 9. :( What did you get for the mean?
i didn't get 9 eeither
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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