【英文跟数学好的请进,关于概率的问题Q1:Twentyfivehockeyplayersareavailableforselectionforthestateteam.Theteamwillhavesixdefenceplayersandfiveforwardplayers.(i)Howmanyteamsofelevenplayersarepossiblefromthe】

　　英文跟数学好的请进,关于概率的问题

　　Q1:Twentyfivehockeyplayersareavailableforselectionforthestateteam.Theteamwillhavesixdefenceplayersandfiveforwardplayers.

　　(i)Howmanyteamsofelevenplayersarepossiblefromthegroupoftwentyfive?

　　(ii)Howmanyteamscanbeselectediffiveforwardsarechosenfromthetenavailableandsixdefenceplayersarechosenfromthefifteenavailable?

　　Q2Amongagroupof40first-yearstudentsatacollegecampushalfofthemgraduatedfromhighschooltheyearbefore,whiletheremaindertooka“gap-year”graduatingfromhighschooltwoyearsbefore.Seventypercentofthefirst-yearstudentsaremaleandsevenofthefemalestudentsgraduatedfromhighschooltheyearbefore.

　　(i)Findtheprobabilitythatarandomlyselectedfirst-yearstudentisbothfemaleand

　　tooka“gap-year”.

　　(ii)Whatistheprobabilitythatgivenarandomlyselectedstudenttooka“gap-year”thestudentismale?

　　Q3(i)Acardisdrawnfromanordinarydeckofplayingcardsthathasbeenshuffledanumberoftimes.Whatistheprobabilitythatthecarddrawnisaredcardoraface

　　card(jack,queenorking)?

　　(ii)Whenanunbiasedsix-sideddieisrolledfivetimeswhatistheprobabilityofhavingonlyoddnumbersresult?