5. Let X and Y be random variables with means X, Y , variances σ 2 X, σ2 Y and correlation coefficient rhoXY . Let a, b and c be constants (a) Find E h (aX + bY ) 2 i . (b) Find Var[aX + bY ] . (c) Find Cov[aX + bY, cX] .

Determine whether the data described are qualitative or quantitative and give their level of measurement if the data are quantitative, state whether they are continuous or discrete. soft drink sizes: small, medium, large. oa. qualitative, nominal o b. qualitative, ordinal- o c. quantitative, ordinal, discrete o d. quantitative, ordinal