The students in four classes recorded their resting pulse rates in beats per minute. The class means and standard deviations are given at right.
a. Which class has students with pulse rates most alike? How can you tell?
b. Can you tell which class has the students with the fastest pulse rates? Why or why not?

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Class First period 79.4 Third period 74.6 Fifth period 78.2 Sixth period 80.2 Mean Standard deviation 3.2 5.6 4.1 7.6