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Mathematics, 29.08.2021 18:30 squawk1738
một tổ có 4 học sinh nữ và 6 học sinh nam . chọn ngẫu nhiên 1 học sinh. gọi X là ngẫu nhiên 1 học sinh nữ được chọn. tính phương sai của X+ 2021
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một tổ có 4 học sinh nữ và 6 học sinh nam . chọn ngẫu nhiên 1 học sinh. gọi X là ngẫu nhiên 1 học si...
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