Tony has 9 sets of baseball cards each set contains 6 cards write 2 equations that tony could use to find how many cards he has

Do you mean like 9x6 and 6x9?

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.