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tranquanghuy12a8ltt
2 năm trước
$\overline{X} = \dfrac{x_1 . n_1 + x_2 . n_2 +...x_k + n_k}{N}$ a) Nếu mỗi 1 giá trị tăng lên `a` đơn bị thì `X` thay đổi thế nào ? b) Nếu mỗi giá trị tăng lên `a` lần thì `X` thay đổi như thế nào ?
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