Question

the dot - plots show the distribution of heights, in inches, for third - grade girls in two classrooms. heights of third grade girls in class 1 dot - plot with number of girls on y - axis and height (inches) on x - axis. heights of third grade girls in class 2 dot - plot with number of girls on y - axis and height (inches) on x - axis. which statement is true? a. the center of the graph of class 1 is best measured by the mean, and the center of the graph of class 2 is best measured by the median. b. the centers of the graphs of class 1 and class 2 are best measured by the mean. c. the center of the graph of class 1 is best measured by the median, and the center of the graph of class 2 is best measured by the mean. d. the centers of the graphs of class 1 and class 2 are best measured by the median.

Explanation:

Step1: Analyze Class 1 data

The data for Class 1 has some outliers (points far from the main cluster). When there are outliers, the median is a better measure of the center as the mean is affected by outliers.

Step2: Analyze Class 2 data

The data for Class 2 is also somewhat skewed with some spread - out points. The median is less affected by extreme values and is a better measure of the center.

Answer:

D. The centers of the graphs of Class 1 and Class 2 are best measured by the median.