The students in Juan's math class have the exact same mean height as the students in Juan's English class. However, while the standard deviation of the student heights in his math class is 3.2 inches, the standard deviation of the student heights in his English class is 6.1 inches. Which of the following statements must be true?

Standard deviation measures the dispersion or variability of a dataset. The math class has a standard deviation of 3.2 inches, while the English class has a standard deviation of 6.1 inches. Because 3.2 is less than 6.1, the heights of the students in the math class are less variable than those in the English class.

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