the mean and std value of a standard normal distribution

Hello,

I used matlab example https://www.mathworks.com/help/stats/normal-distribution.html

Compute the pdf of a standard normal distribution, with parameters µ equal to 0 and σ equal to 1. The mean value of norm should be 0, and the std value of norm should be 1.

Why the mean value of norm is 0.1636, and the std value is 0.1408?

Thanks in advance!

Yue

    x = [-3:.1:3];
    norm = normpdf(x,0,1);
    >> norm_mean=mean(norm)

    norm_mean =

    0.1636

    >> norm_std=std(norm)

    norm_std =

    0.1408

[Adam]

You are taking the mean and std of the values on the y axis of the pdf, not the x axis, which is a fairly meaningless statistic.

[yue li]

Hello, Adam,

Thank you so much for your great help!

Yue

Answer 1

[Image Analyst]

norm() is a built-in function so don't use that for your variable name.

Try using randn() and then using mean() and std() on that.

[yue li]

Hello, Image Analyst,

Thank you do much for your reminding!

Yue