The given set is .

To find the mean: Add the numbers and then divide by the number of values in the data set.

                                   (Add: )

                                        (Divide: )

To find the variance: Square the difference between each number and the mean.Then add the square,and divide by the number of values.

   (Subtract)

                                    (Add: )

.                                        (Divide: )

The standard deviation is the square root of the variance.

                                   (Take the square root of the variance)

                                    (Evalute power )

                                             (Cancel square and root)

The mean absolute deviation is .