The least and greatest values in data set X are j and k. respectively, and the least and greatest values in data set Y are p and r, respectively, where j < k < p < r. The least value in data set Z is the average (arithmetic mean) of j and k, and the greatest value in data set Z is the average of p and r.
Quantity A
The average of the range of the values in data set X and the range of the values in data set Y
Quantity B
The range of the values in data set Z