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anhnguyenff2008
2 năm trước
thời gian làm một bài toán( tính bằng phút) của 30 học sinh lớp 7A 10 5 8 8 9 7 8 9 14 8 5 7 8 10 9 8 10 7 14 8 9 8 9 9 9 9 10 5 5 14 a)tìm dấu hiệu, có bao nhiêu giá trị,có mấy giá trị khác nhau b)lập bản tần số,tìm mốt,tính trung bình c)nhận xét
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