consider two portfolios A and $B.$ The possible returns of each portfolio are as follows

Portfolio A: $\{12,13,14,16,15,6,7,1,13,5\}$

Portfolio B: $\{15,15,15,17,14,8,1,11,6,4\}.$

$($i$)$ For each portfolio, compute mean, the variance, and the coefficient of variation

$($ii$)$ Which portfolio is riskier?

$1$