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Numerical vaule of multinormal distribution


I have a basic question.
I want toobtain the numerical value of the cumulative normal probability distribution function at some points.
I have the following code to do this :
 
Off[General::spell1];
Needs["Statistics`MultinormalDistribution`"];
r = {{0.8, 0.1}, {0.1, 0.2}};
ndist = MultinormalDistribution[{1, 0.4}, r];
CDF[ndist, {-1, 1}]


The output I obtain is:

CDF[MultinormalDistribution[{1, 0.4}, {{0.8, 0.1}, {0.1, 0.2}}], {-1, 1}]

I would like to have the numerical value of this expression. 
How could I do?


Pratim
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