Thomas records the masses of several rocks as 7.40 g, 7.85 g, 7.60 g, and 7.40 g. What is the mode of Thomas’s data set?

The mode is the value that appears most often in a data set. The mass 7.40 g appears twice, while 7.85 g and 7.60 g each appear once. Therefore, the mode is 7.40 g, choice B.

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