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hongphuocnguyen15
2 năm trước
Bài 2: Trước khi thi đấu một vận động viên bắn súng được kiểm tra bằng cách bắn 100 phát. Điểm số các lần bắn được ghi lại như sau: 30 lần điểm 10, 20 lần điểm 9, 20 lần điểm 8, 10 lần điểm 7, 20 lần điểm 6. Tính “Điểm số trung bình sau 100 lần bắn” và nhận xét.
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