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.

Ashare stock is a small piece of ownership in a company ture or false

What type of negotiating strategy requires the supplier to open its books to the purchasers? a. competitive biddingb. cost-based price modelc. price-based modeld. market-based price modele. transparent negotiations

Suppose that a major city’s main thoroughfare, which is also an interstate highway, will be completely closed to traffic for two years, from january 2014 to december 2015, for reconstruction at a cost of $535 million. if the construction company were to keep the highway open for traffic during construction, the highway reconstruction project would take much longer and be more expensive. suppose that construction would take four years if the highway were kept open, at a total cost of $800 million. the state department of transportation had to make its decision in 2014, one year before the start of construction (so that the first payment was one year away). so the department of transportation had the following choices: (i) close the highway during construction, at an annual cost of $267.5 million per year for two years. (ii) keep the highway open during construction, at an annual cost of $200 million per year for four years. now suppose the interest rate is 80%. calculate the present value of the costs incurred under each plan.