Suppose that you have a sample of 500 observations on two random variables: price denoted as X, and profit, denoted as Y So you observe {xi, yi} for i=1,500 Write down the formula for sample mean and...

Suppose that you have a sample of 500 observations on two random variables: price denoted as X, and profit, denoted as Y So you observe {xi, yi} for i=1,500 Write down the formula for sample mean and sample variance of X and Y as well as the sample covariance between X and Y