Show That A Ex2 Ex2 B Cov Xy Ex

Show that
a. E(X2) ≥ [E(X)2]
b. cov (X,Y) = E[(X – µX)(Y – µY)]
= E(XY) – µXµY
where µX = E(X) and µY = E(Y).
How would you express these formulas verbally?

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