The mean test scores with standard deviations of four English classes are given. Class Mean Standard Deviation Mrs. Jones 89 1 point 9 Mrs. Rijo 82 1 point 4 Mr. Phan 73 3 point 4 Mrs. Scott 90 6 point 1 Which statement is most likely to be true?

Standard deviation measures how spread out scores are from the class mean. The smallest standard deviation is 1.4 for Mrs. Rijo’s class, so her students’ scores are most tightly clustered around their mean. Therefore, the most likely statement is that Mrs. Rijo’s class scores are closest to the class mean.

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