Roberta grows pea plants, some in shade and some in sun. She picks 8 plants of each type at random and records the heights.

Shade plant heights (in.) : 7, 11, 11, 12, 9, 12, 8, 10

Sun plant heights (in.) : 21, 24, 19, 19, 22, 23, 24, 24

Express the difference in the means as a multiple of their ranges.

The correct answer for this question is this one: Mean difference is 12

The given data is this

Shade plant heights (in.) : 7, 11, 11, 12, 9, 12, 8, 10

Sun plant heights (in.) : 21, 24, 19, 19, 22, 23, 24, 24

So, we need to do subtraction in order to get the mean difference

The differences are: 14, 13, 8, 7, 13, 11, 16, 14

Then, we add the difference and divide it by 8

Sum = 96

Mean = 96 / 8 = 12