Mathematics, 10.08.2021 14:00 eymurezgi1

1 xạ thủ có 3 viên đạn khả năng bắn chúng bia là 0,8.xạ thủ bắn từng viên cho đến khi trùng bia hoặc hết đạn thì dừng. gọi x là số viên đạn được bắn. phương sai của nó là:

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1 xạ thủ có 3 viên đạn khả năng bắn chúng bia là 0,8.xạ thủ bắn từng viên cho đến khi trùng bia hoặc...