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50% invested in stock A and 50% invested in stock B. the following table, and the fact that the correlation of A and B is 0.4

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Answer #1

Stock A

Year Return(%) Deviation form expected return (D) D^2
2008                                   (5.00)                                 (8.83)                                          77.97
2009                                     8.00                                   4.17                                          17.39
2010                                     8.00                                   4.17                                          17.39
2011                                   (2.00)                                 (5.83)                                          33.99
2012                                     2.00                                 (1.83)                                             3.35
2013                                   12.00                                   8.17                                          66.75

Expected Return = Sum of returns/No. of returns

= (-5+8+8-2+2+12)/6

= 23/6

= 3.83%

Variance = {\sum }D^2/n-1

= (77.97+17.39+17.39+33.99+3.35+66.75)/5

= 216.83/5

= 43.366

Standard Deviation = \sqrt{}Variance

= \sqrt{}43.366

= 6.59%

Stock B

Year Return(%) Deviation form expected return (D) D^2
2008                                   19.00                                   8.17                                          66.75
2009                                   35.00                                 24.17                                        584.19
2010                                     7.00                                 (3.83)                                          14.67
2011                                   (9.00)                               (19.83)                                        393.23
2012                                 (14.00)                               (24.83)                                        616.53
2013                                   27.00                                 16.17                                        261.47

Expected Return = Sum of returns/No. of returns

= (19+35+7-9-14+27)/6

= 65/6

= 10.83%

Variance = {\sum }D^2/n-1

= (66.75+584.19+14.67+393.23+616.53+261.47)/5

= 1936.83/5

= 387.366

Standard Deviation = \sqrt{}Variance

= \sqrt{}387.366

= 19.68%

Portfolio Standard Deviation = phpC8b8sT.png [(WA*SDA)^2 + (WB*SDB)^2 + (2*WA*WB*SDA*SDB*CorAB)]

where

WA - Weight of stock A =.5

WB - Weight of stock B =.5

SDA - Standard Deviation of stock A = 6.59

SDB - Standard Deviation of stock B =19.68

CorAB - Correlation coefficient = .47

Portfolio Standard Deviation = phpC8b8sT.png [(.5*6.59)^2 + (.5*19.68)^2 + (2*.5*.5*6.59*19.68*.47)]

= phpC8b8sT.png [10.857025+96.8256+30.477432]

= phpC8b8sT.png 138.160057

= 11.75%

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