lớp 6a tham gia dự kiến khảo sát biết rằng 20% số bài đạt loại khá là 4 bài, só bài loại giỏi chiếm 3/4 số bài loại khá. còn lại là loại trung bình. a. tính học sinh loại giỏi lớp 6a b.tính học sinh loại khá lớp 6a c.biết răng số bài trung bình là 25% số loại khá.tính số học sinh lớp 6a tham gia khảo sát

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