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standard deviation of a data set

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Find the standard deviation for the group of data items 15, 11, 15, 11, 15, 11, 15, 11? rounded to 2 decimal places. ?

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standard deviation
find the standard deviation for the group of data items 15, 11, 15, 11, 15, 11, 15, 11 ? rounded to 2 decimal places. ?

The standard deviation described by ...

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