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17 16 18 24 20 18 17 15 24 20 17 22 22 18 16 15 18 18 Dấu hiệu điều tra A số lớp trong 1 trường B số hs nữ mỗi lớp C số lớp và số hs Đ cả A,B,C Số lớp có 20 hs chiếm tỉ lệ A 20% B25% C30% D35% Số lớp có nhiều hs nữ nhất A2 B3 C4 D5
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