When the outlier(s) are removed, how does the mean change? The mean decreases by 2.1
The mean increases by 1.6.
The mean increases by 2.1.
There are no outliers.

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.