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show probabilities (-inf+inf, -3dev-3dev and so on....)

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Amer Al-Maashani
Amer Al-Maashani 2021-1-28
编辑： James Tursa 2021-1-28
show probabilities (-inf+inf, -3dev-3dev and so on....)
>> mu = 12.5;
sigma = 3.75;
xs = [0:.01:25];
ys = normpdf(xs, mu, sigma);
clf;
plot(xs, ys);
Follow with the mean and std
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James Tursa
James Tursa 2021-1-28
"show probabilities (-inf+inf, -3dev-3dev and so on....)"
I have no idea what is being asked for here. Cumulative probability between the two values? Or ...?
Amer Al-Maashani
Amer Al-Maashani 2021-1-28
'by integrating pdf You can find the probability of the signal apperance in given level ranges' teacher's explanation.

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James Tursa
James Tursa 2021-1-28
编辑：James Tursa 2021-1-28
"Integrating pdf" and "probability ... in given level ranges" sounds like the teacher wants you to use the cdf to get the cumulative probability between a range of values. E.g., maybe this is what is being asked:
>> mu = 12.5;
>> sigma = 3.75;
>> pd = makedist('Normal','mu',mu,'sigma',sigma); % Make a Normal pdf
>> cdf(pd,inf) - cdf(pd,-inf) % the integrated probablility between -inf and +inf
ans =
1
>> cdf(pd,mu+3*sigma) - cdf(pd,mu-3*sigma) % the integrated probablity between mu-3sigma and mu+3sigma
ans =
0.9973

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