【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!Inthecasinogamecalledhigh-low,therearethreepossiblebets.Assumethat$1isthesizeofthebet.Apairoffair6-side】

　　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!Inthecasinogamecalledhigh-low,therearethreepossiblebets.Assumethat$1isthesizeofthebet.Apairoffair6-sideddiceisrolledandtheirsumiscalculated.Ifyoubet

　　Low,youwin$1ifthesumofthediceis{2,3,4,5,6}.ifyoubethigh,youwin$1ifthesumofthediceis{8,9,10,11,12}ifyoubeton{7}youwin$4ifasumof7isrolled.Otherwiseyouloseoneachofthethreebets.Inallthreecases,yourorigionaldollarisreturnedtoyouifyouwin.Findtheexpectedvalueofthegametothebetterofthebetofhigh.