NO.PZ2015120604000094
问题如下:
Considering Z refers an random varible of the standard normal distribution, P(0≤Z≤1.65) is equal to ?
选项:
A. 0.47.
B. 0.46.
C. 0.45.
解释:
C is correct.
From the standard normal distribution table, F(1.65) = 0.95. So P(0≤Z≤1.65) = F(1.65)-Z(0) = 0.95-0.5 = 0.45.
我记得老师讲的里面1.65是u+1.65✖️标准差。 这个是90%,但这道题u没给,标准差也没给,怎么就算出来了呢? 谢谢