The band at hawthorn middle school consists of students in the sixth, seventh, and eighth grades. Students participation on the band is described by the two way table below

51

Step-by-step explanation:

Add the total that participation in the band from all 3 grades.

B. 51

Step-by-step explanation:

All you have to do is add 19, 15, and 17 and you should get 51

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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.