问题
填空题
已知X~N(0,1),则P(-1<X<2)=________.
答案
0.818 5
∵P(-1<X<1)=0.682 6,
P(-2<X<2)=0.954 4,
∴P(1<X<2)= (0.954 4-0.682 6)=0.135 9.
∴P(-1<X<2)=0.682 6+0.135 9=0.818 5.
已知X~N(0,1),则P(-1<X<2)=________.
0.818 5
∵P(-1<X<1)=0.682 6,
P(-2<X<2)=0.954 4,
∴P(1<X<2)= (0.954 4-0.682 6)=0.135 9.
∴P(-1<X<2)=0.682 6+0.135 9=0.818 5.