what is the mean and standard deviation of this data set
72, 90, 85, 84, 91, 78, 94, 86, 82, 78, 86, 78, 95, 90, 88

Question

what is the mean and standard deviation of this data set
72, 90, 85, 84, 91, 78, 94, 86, 82, 78, 86, 78, 95, 90, 88

mathmale · Answer

Review the meanings of "mean" and "standard deviation."

To find the mean (arithmetic average) of the given data set, add up all the data points.  Then divide this sum by the number of data points.  Your result?   

We'll assume that this data set is a sample (not a population).

Please look up "sample standard deviation" and copy down the formula you find for this.

Note:  This problem could be done in under 2 minutes if you have a TI-83 or -84 calculator.

anonymous · Answer

just add these numbers up on a piece of paper and divide by 15 to get the mean

mathmale · Answer

You will need the mean to calculate the std. deviation.