In: Finance
You have owned the following two stocks over the past 5 years
| Year | Sock A's Price | Stock B's Price | 
| 2014 | 67 | 31 | 
| 2013 | 46 | 25 | 
| 2012 | 44 | 23 | 
| 2011 | 50 | 18 | 
| 2010 | 34 | 19 | 
a. What is the standard deviation of a portfolio's return in which 50% of your portfolio is in each stock? ( Hint: Calculate the holding period return first)
Please show all work and finance formulas.