Suppose all stocks had a standard deviation of 30%6 and a correlation with Each other of . 4. What is the standard deviation of the returns on a portfolio that has Equal holdings in 50 stocks ?" When calculating the portfolio variance with 50 stocks with the same standard deviation [O. SO^), the same weight in the portfolio 10. 20^), and all pairs having the Same correlation [OEfficient 1 0. 407 . The variance calculation :" `` = 5010. 20 7 -10. 307 + [1507 7 - 501 10. 02} (0. 40 1 10.307 = 0.03708 . 0 = 0. 193 = 19.3:36