解:(I)该人被录用的概率P=1-P=1-0.2×0.5×0.8=0.92;
(II)设该人被录用的工种数为n,
则X=n(3-n),n=0,1,2,3 ,
∴X=0或2,
i)P(X=0)=P(A·B·C)+P=0.8×0.5×0.2+0.2×0.5×0.8=0.16,
P(X=2)=1-P(X=0)=0.84,
∴EX=0×0.16+2×0.84=1.68 .
ii)当X=0时,是奇函数,
当X=2时,是偶函数,
∴P(D)=P(X=2)=0.84。
© 2017-2019 超级试练试题库,All Rights Reserved.