设随机变量x~n(0.8,0.04),求下列概率,(1)P(X>0.5) (2)P(-0.2
2019-05-30
设随机变量x~n(0.8,0.04),求下列概率,
(1)P(X>0.5) (2)P(-0.2
优质解答
(1)
P(X>0.5)
=P((X-0.8)/0.2>(0.5-0.8)/0.2)
=P((X-0.8)/0.2>(-1.5))
=P((X-0.8)/0.2
(1)
P(X>0.5)
=P((X-0.8)/0.2>(0.5-0.8)/0.2)
=P((X-0.8)/0.2>(-1.5))
=P((X-0.8)/0.2