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The direct answer to the question in the image is **C) \(\mu_2 < \mu_1\) and \(\sigma_2 > \sigma_1\)**.

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 μ1 and μ2 be the means before and after exercise, respectively, and let σ1 and σ2 be the standard deviations before and after exercise, respectively. Which of the following is true?
A) μ1 > μ2 and σ1 > σ2
B) μ1 > μ2 and σ1 < σ2
C) μ1 < μ2 and σ1 > σ2
D) μ1 < μ2 and σ1 < σ2

This problem explores pulse rate changes in students before and after exercise. It highlights key statistical concepts, including calculating mean and standard deviation, and applies them to real-world data. Suitable for high school students in Grades 9-12.

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