Math

The 22 students in a health class conducted an experiment in which they each recorded their pulse rates, in beats per minute, before and after completing a light exercise routine. The dot plots below display the results.

Let s₁ and r₁ be the standard deviation and range, respectively, of the data before exercise, and let s₂ and r₂ be the standard deviation and range, respectively, of the data after exercise. Which of the following is true?