求一道很简单的数学概率题!英文稍好的进!
现在是10月5日上午9点36 我希望到晚上六点前有结果!In the casino game called high-low ,there are three possible bets.Assume that $1 is the size of the bet .A pair of fair 6-sided dice is rolled and their sum is calculated.If you bet
Low ,you win $1 if the sum of the dice is {2,3,4,5,6}.if you bet high ,you win $1 if the sum of the dice is {8,9,10,11,12} if you bet on {7} you win $4 if a sum of 7 is rolled.Otherwise you lose on each of the three bets.In all three cases,your origional dollar is returned to you if you win.Find the expected value of the game to the better of the bet of high.