Mathematics, 08.09.2021 17:50 shakiyahjones99441
Một hộp đựng 12 bóng đèn, trong đó có 5 bóng đèn bị hư. Lấy ngẫu nhiên từ hộp ra 2 bóng đèn. Gọi X là số bóng đèn bị hư lấy được trong 2 bóng đèn lấy ra. Tìm E(X); D(X) và mod X.
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Một hộp đựng 12 bóng đèn, trong đó có 5 bóng đèn bị hư. Lấy ngẫu nhiên từ hộp ra 2 bóng đèn. Gọi X l...
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