Example 1 Then the covariance is 3333 COv(X,Y)=E[XY]-E[X]E[Y]= 10 -4×8= 1601 .X and Y are not independent as it is not true that fx.y(x,y)=fx(x)fy(y).Example 1 • Then the covariance is cov X, Y = E XY − E X E Y = 3 10 − 3 4 × 3 8 = 3 160 . • 𝑋 and 𝑌 are not independent as it is not true that 𝑓𝑋,𝑌 𝑥, 𝑦 = 𝑓𝑋 𝑥 𝑓𝑌 𝑦 . 5