Show that a E(X2) E(X)2 b cov (X,Y) E (X X)(Y Y) E(XY) XY where X E(X) and Y E(Y) How would you express these formulas verbally

Question: Show that a. E(X2) [E(X)2] b. cov (X,Y) = E[(X - X)(Y - Y)] = E(XY) - XY where X = E(X) and Y

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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