把十个正方体玩具全部投出,设出现六点的正方体玩具个数为x,则P(x小于等于2)等于
把十个正方体玩具全部投出,设出现六点的正方体玩具个数为x,则P(x小于等于2)等于
数学人气:901 ℃时间:2019-10-17 05:10:29
优质解答
P(X=2)=(C10 2)*(1/6)^2*(5/6)^8≈0.291P(X=1)=(C10 1)*(1/6)^1*(5/6)^9≈0.323P(X=0)=(C10 0)*(1/6)^0*(5/6)^10≈0.162所以P(X≤2)=P(X=2)+P(X=1)+P(X=0)=0.291+0.323+0.162≈0.776
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