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    %% Variance of a Fitted Distribution  

%% 
% Load the sample data. Create a vector containing the first column of students'
% exam grade data. 
load examgrades
x = grades(:,1);  

%% 
% Fit a normal distribution object to the data. 
pd = fitdist(x,'Normal')  

%% 
% Compute the variance of the fitted distribution. 
v = var(pd) 

%%
% For a normal distribution, the variance is equal to the square of the
% parameter |sigma|.