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Business, 15.09.2021 03:20 stephstewart1209

Một người tham gia trò chơi bằng cách phải trả lời hết 20+k câu hỏi trắc nghiệm, mỗi câu có 5 đáp án, trong đó chỉ có 1 đáp án đúng. Mức giá khi tham gia trò chơi là 3000 đồng mỗi câu, trả lời đúng 1 câu thì được thưởng 10000 đồng. Giả sử người đó không biết gì về các câu hỏi, trả lời bằng cách trọn ngẫu nhiên một đáp án cho mỗi câu hỏi. a, Sau khi chơi xong, trung bình người đó lãi được bao nhiêu tiền.
b, Tính xác suất để sau khi chơi xong người đó không bị lỗ
c, Tìm mức thưởng cho mỗi câu trả lời đúng để trung bình sau khi chơi xong người đó không bị lỗ.

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