4). [30 points) For a sample of 3 years stock A and stock B demonstrated the following returns. Asset A Asset B 0.26 0.23 0.2 0.1 0.2 (a). Without any calculation show the riskier asset and justify your answer. (b). Calculate (i) the variances and standard deviations and infer which stock is riskier. (1). Calculate the coefficient of variation. (ini). Calculate the covariance of returns and interpret its value. (iv). Calculate the correlation coefficient and interpret its value