10x
33, 21, 12, 12, 33, 13, 11, 22, 22, 23

p(x1)=4/10
p(x2)=4/10
p(x3)=2/10

p(y1)=2/10
p(y2)=4/10
p(y3)=4/10

p(x3,y3)=2/10
p(x2,y1)=1/10
p(x1,y2)=2/10
p(x1,y3)=1/10
p(x1,y1)=1/10
p(x2,y2)=2/10
p(x2,y3)=1/10

p(x3,y3)=2/10
p(x3) * p(y3) = 2/10 * 4/10 = 8/100
nem egyenloek uh nem fuggetlenek

cov(x,y) = e(xy) - e(x) * e(y)

e(x) = 1*4/10 + 2*4/10 + 3*2/10 = 4/10 + 8/10 + 6/10 = 18/10
e(y) = 1*2/10 + 2*4/10 + 3*4/10 = 2/10 + 8/10 + 12/10 = 22/10

e(xy) = 9*2/10 + 2*1/10 + 2*2/10 + 3*1/10 + 1*1/10 + 4*2/10 + 6*1/10 = 18/10 + 2/10 + 4/10 + 3/10 + 1/10 + 8/10 + 6/10 = 42/10

cov(x,y) = 42/10 - 18/10 * 22/10 = 42/10 - 396/100 = 420/100 - 396/100 = 24/100 - 6/25