Select the correct answer.
Which data set has the greatest spread for the middle 50% of its data?

A. {18, 13, 22, 17, 21, 24}

B. {17, 19, 22, 26, 17, 14}

C. {13, 17, 12, 21, 18, 20}

D. {18, 21, 16, 22, 24, 15}

The stem-and-leaf plot shows the heights in centimeters of teddy bear sunflowers grown in two different types of soil. soil a soil b 5 9 5 2 1 1 6 3 9 5 1 0 7 0 2 3 6 7 8 2 1 8 3 0 9 key: 9|6 means 69 key: 5|8 means 58 calculate the mean of each data set. calculate the mean absolute deviation (mad) of each data set. which set is more variable? how do you know?