zzmingzz
幼苗
共回答了18个问题采纳率:83.3% 举报
Q1:概率 - 互斥事件与独立事件
the probability that event E or event F or both will occur实质上就是问P(E∪F)的值
Statement (1):Insufficient
Statement (2):Insufficient
Together:由于题目中并未给出事件E和事件F的关系,(1)+(2)分两种情况:
①如果E和F为互斥事件,P1=P(E)+P(F)=0.6+0.4=1
②如果E和F为独立事件,P2=P(E)+P(F)-P(E∩F)=0.6+0.4-0.6*0.4=0.76
P1≠P2,Insufficient
选E
Q2:集合 - 韦恩图
设both report a net profit and invest in foreign markets的Business数量为X,not report a net profit nor invest in foreign markets last year的Business数量为Y,如图所示.
条件一:Business总数为30
条件二:Report a net profit 的Business为21
条件三:Invest in foreign markets 的Business为15
根据以上条件可以列出等式:Y=30-(21+15-X) => Y=X-6
Statement (1) :
=> X=12=>Y=6,Sufficient
Statement (2) :
=> 21+15-X=24 => X=12 => Y=6,Sufficient
选D
1年前
1