Question

我的作业从第3题就不会了撒.大侠们救命啊~网络就靠你们啦~T.T

Answer 1

3.定日报的X,晚报的Y,全定的就是XY.

则：X+XY=60%

y+XY=30%

(1-X)(1-Y)=25%

XY=15%

4.甲不中概率是0.1,乙不中概率是0.2,则目标不被击中概率是0.02.

所以目标被击中概率是98%

5.(135/150)^3*(15/150)^2=0.00729

6.(1)0.6^3=0.216

(2)0.6^2*0.4=0.144

(3)0.4^2*0.6=0.096

(4)0.4^3=0.064

7.(C40 2)/(C50 2)=63.7%

1-(C40 3)/(C50 3)=1-50.41%=49.59%

8.(1)1-i1-i2-i3-i4

(2)1-i1*i2*i3-i4*i2*i3-i1*i2*i4

(3)1-i1*i2*i3*i4