书上题目:The variable Q follows an extreme Type I distribution with mu=100 and sigma=12. Calculate FQ(150) and fQ(150). 书上答案是:FQ(150)=0.997fQ(150)=2.86e-4. 我用 MATLAB 计算: evpdf(150,100,12) ans = 5.2281e-028 evcdf(150,100,12) ans =   ...
书上一道题目: Let X be a lognormal random variable with a mean value of 250 and a standard deviation of 30.Calculate Fx(200) and fx(200). 书上的 结果 是: Fx(200)=0.0384 and fx(200)=0.00348. 我用 MATLAB 计算如下: Fx(200): logncdf(200,250,30) ans = 1.7212e-016 fx ...