# Expected Value Quadratic Calculations

Let X be a random variable and let c be a constant.

Show that E(X-c)^2 is a minimum when c = E[X]

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#### Solution Preview

This is a quadratic function of c, and let it be f(c) = ...

#### Solution Summary

This solution uses the quadratic function of c and shows when E(X-c)^2 is a minimum. All calculations and formulas are shown in a structured manner.

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