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find x for randon variables 4 probability .10, 6 pis .60 and 8 probabiltiy .30 compute the mean and expected value

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The mean and the expected value are pretty much the same thing.  So all you do is multiply each number by its probabilitdamned then add:

 

4 * .1 + 6 * .6 + 8 * .3 =  6.4. (Hopefully this is right, I'm just learning it myself, currently...)

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