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Plot normal distribution with unknown mean that is normally distributed with known parameters

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How can I use Matlab to plot a univariate normal distribution when it has unknown mean but the mean is also normally distributed with known mean of mean and variance of mean?
Eg. N(mean, 4) and mean ~N(2,8)

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Thorsten am 7 Apr. 2017
2 + 8*randn(1, 100) + 4*randn(100,1);
or in more detail
n = 1; m = 100; % number of samples
m1 = 2; s1 = 8; s2 = 4;
m2 = m1 + s1*rand(n, m);
X = m2 + s2*rand(n, m);

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