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The expected value of a random variable is a weighted average of all possible values a random variable can take on, with the weights equal to the probability of taking on that value.

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Is there anything interesting to be taken from the fact that $E[(X-E[X])(Y-E[X])] = E[(X-E[X...

Wow this got me thinking for awhile. So I tried some different manipulations to see where things goes: It seems you can get to the covariance in many ways but I notice the pattern that at least one of …
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