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Is the expected value of the square equal to the average value of the square?
No, it's a specific value-the square of the average, and then see how many specific ones there are, four of which are at 4.

First, add the square of (specific value-average) plus the square of (second specific value-average), and so on. What is the specific value? Remember to add all the numbers squared (specific value-average) first, and then the variance is the magnitude of the change.