Bài 1: Bảng điểm kiểm tra toán của học sinh lớp 7B được cho ở bảng như sau: 10 8 7 4 7 8 5 10 10 7 8 8 9 9 7 9 8 9 8 9 9 8 10 8 9 7 10 9 8 7 8 9 8 7 10 8 a) Dấu hiệu cần tìm hiểu ở đây là gì? b) Lập bảng “tần số” và nêu vài nhận xét. c) Vẽ biểu đồ đoạn thẳng.

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