题目

2.(单选题)设X~N(2,0.25),查表求P(X≤2.2)=()A. 0.7881B. 0.6554C. 0.5D. 0.9861

2.(单选题)设X~N(2,0.25),查表求P{X≤2.2}=()

A. 0.7881

B. 0.6554

C. 0.5

D. 0.9861

题目解答

答案

B. 0.6554