X1 = c(2.5, 0.5, 2.2, 1.9, 3.1, 2.3, 2, 1, 1.5, 1.1)
X2 = c(2.4, 0.7, 2.9, 2.2, 3, 2.7, 1.6, 1.1, 1.6, 0.9)
var(X1)
[1] 0.6165556
var(X2)
[1] 0.7165556
cov(1,X2)
Error in cov(1, X2) : incompatible dimensions
cov(X1,X2)
[1] 0.6154444
plot(cov(X1,X2))
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