Question

The ages (in years) of the students in two ballet classes are shown below.

Class 1: 14, 8, 8, 10, 15, 12, 10, 7
Class 2: 9, 12, 10, 12, 10, 8, 12, 13, 11, 8
Which statement best compares the mean and range of the data for the two ballet classes?

A
The means are equal, but the range is greater in class 1 than in class 2.

B
The mean and range are greater in class 1 than in class 2.

C
The means are equal, but the range is greater in class 2 than in class 1.

D
The mean and range are greater in class 2 than in class 1.

Answer 1

A.

Explanation:

Class 1: 14, 8, 8, 10, 15, 12, 10, 7

Class 2: 9, 12, 10, 12, 10, 8, 12, 13, 11, 8

The mean of class 1 = 84/8 = 10.5

The range = 15 - 7 = 8.

The mean of class 2 = 105./10 = 10.5.

The range = 13 - 8 = 5.