设随机变量ξ~N(0,1),已知φ(1.96)=0.975,则P(|ξ|<1.96)=(  

2024-12-21 05:52:12
推荐回答(1个)
回答1:

∵ξ~N(0,1)
∴P(|ξ|<1.96)
=P(-1.96<ξ<1.96)
=Φ(1.96)-Φ(-1.96)
=2Φ(1.96)-1
=0.950
故选B.