Question

If cov(X , Y) = 5, then cov(2X , 3Y) = ?​

Answer 1

Answer:

Cov(X, Y) = Cov(Y, X) How are Cov(X, Y) and Cov(Y, X) related? stays the same. If X and Y have zero mean, this is the same as the covariance. If in addition, X and Y have variance of one this is the same as the coefficient of correlation.