I need help on this. (Be carefull!)

   1st . evaluate the terms inside the parentheses

                2nd .evaluate the terms inside the brackets.

                 3rd. evaluate the terms inside the braces

                  4th. evaluate the terms outside the brackets

an advantage of the standard deviation is that it increases as the dispersion of the data increases. e. the interquartile range is preferred when the data are not skewed or no have outliers. an advantage of the standard deviation is that it uses all the observations in its computation.