设X~N(3,2^2)(1)求P{-4c}=P{Xd}>=0.9,问d至多为多少?

Question

设X~N(3,2^2)(1)求P{-43};(2)确定c使得P{X>c}=P{X<=c};(3)设d满足P{X>d}>=0.9,问d至多为多少?

Answer 1

1.约等于100%
50%
2.c=3
3.题目有问题,d至多为0.43