Frequency curves for the distribution of blood pressure readings of certain anthletes before exercise (A) and after exercise (B) are plotted together as shown in the figure above. From the frequency curves, which one of hte following can be concluded?

Options

A. Both distributions are identical
B. Both distributions have the same mean value
C. Both distributions have the same bean value but different variance
D. Both distributions have the same variance but different mean values

Answer

D

Explanation

From observation of the graph it is noted the nature is similar, but are centered around different values, hence, they have same variance, but different mean values.