It has been argued that stock risks can be managed through portfolio diversification. Kapito funds as an opportunity to invest in Haraka and Baraka stocks whose returns are indicated below;  Period Haraka Returns Baraka returns:

1  4% 10%
2  4% 11% 
3  -8% -7% 
4  8% 18%

 
i. Determine the risk of each security using standard deviation