• (need for future chapters, basic statistics, variance and covariance formula) Suppose there is two different variables as

X=(x_1, x_2, x_{3 .}x₁₀) and Y=(y_1, y_2, y_3, ..y₁₀).

• -Explain how would you calculate variance of X [ Var(X) ].
• -Explain how would you calculate variance of Y [ Var(Y)] .
• -Explain how would you calculate covariance of X and Y [Cov(X,Y)].