![Mathematics](/tpl/images/cats/mat.png)
Mathematics, 05.08.2021 04:30, ctyrector
Trong một chiếc hòm có 5 bóng đèn trong đó có 2 bóng tốt và 3 bóng hỏng. Ta chọn
ngẫu nhiên từng bóng đem thử (thử không hoàn trả lại) cho đến khi thu được hai bóng tốt.
Gọi X là số lần thử cần thiết. Lập bảng phân bố xác suất của X. Trung bình cần bao nhiêu
lần thử?
![answer](/tpl/images/cats/otvet.png)
Answers: 2
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Do you know the correct answer?
Trong một chiếc hòm có 5 bóng đèn trong đó có 2 bóng tốt và 3 bóng hỏng. Ta chọn
ngẫu nhiên từng bó...
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