The Expected Value of a Linear Combination of Variables

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You may know the average of X, and the average of Y. But what if you create a new variable that has a little bit of X and a little bit of Y? What is this new variable's average? It turns out its quite easy.
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I can't believe how this video has such few views! This was a lovely lesson, especially for a conceptual learner like me who needs in-depth explanations and examples. Thanks for making a daunting topic seem a lot easier :)

sunnylefabulous