Am I right in thinking that the reason for bold xy below in

E(XY) = integral (twice)

is because

E(X) = integral

E(Y) = integral

ergo the x and y (or xy) would multiply in the same way?

Miles

E(XY) = integral (twice)

**xy**.8/3xy dydxis because

E(X) = integral

**x**.f(x) dxE(Y) = integral

**y**.f(y) dyergo the x and y (or xy) would multiply in the same way?

Miles

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