Which of the following equations determines E(XY)? »(x, x y (х, у) ,(x,

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Which of the following equations determines E(XY)?
xyfry (x, y)dxdy
x y
(x, y) / vfry (x, y)dydx
fy(x, y) / f»(x, y)dydx
// xwf»(x, y)dydx
x y
Transcribed Image Text:Which of the following equations determines E(XY)? xyfry (x, y)dxdy x y (x, y) / vfry (x, y)dydx fy(x, y) / f»(x, y)dydx // xwf»(x, y)dydx x y
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