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Greenville Middle School just announced the $16$ homeroom classes for the next school year. Most of the homerooms have at least $20$ students, while the biggest class has $28$. The mean number of students in a homeroom is about $24$, and the mean absolute deviation is $2.25$ students.$\newline$Which is a measure of how much the number of students in the new homerooms typically varies?$\newline$Choices:$\newline$(A)$2.25$ students$\newline$(B)$20$ students$\newline$(C)$24$ students$\newline$(D)$28$ students$\newline$