The set of data is .

Find the mean:

Add the numbers and then divide by the number of values in the data set.

                        (Add: )

                           (Divide: )

The mean is .

To find the variance:

Square the difference between each number and the mean.

Then add the squares,and divide by the number of values.

                    (Add: )

.                        (Divide: )

The variance is .

The standard deviation is the square root of the variance.

                  (Take the square root of the variance)

                       (Cancel square and root)

.                       (Use calculator)

The standard deviation is .

The mean is .

The variance is .

The standard deviation is .