Help! I dont understand this math question

Last option

Step-by-step explanation:

If we expand, , and we see that the middle term is not negative. Thus, we need to make both factors negative so that .

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.