"The mean age for freshmen is 18; for sophomores, 19; for juniors, 20; and for seniors,21. Therefore, the mean age of the student body is 19.5." Do you agree or not, and if not, why not?

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The Answer of "The mean age for freshmen is 18; for sophomores, 19; for juniors, 20; and for seniors,21. Therefore, the mean age of the student body is 19.5." Do you agree or not, and if not, why not?

"The Mean Age for Freshmen Is 18; for Sophomores, 19;