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The ER for GE is 8.04% and the ER for AT&T is 13.38% while the SD...

The ER for GE is 8.04% and the ER for AT&T is 13.38% while the SD for GE is 10.66% and the SD for AT&T is 6.41%. The CORR(GE,AT&T) equals -.11. The portfolio standard deviation of the combination of 80% in GE and 20% in AT&T is:

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Answer #1

wg = 0.8, wa = 0.2

SD g = 10.66%, SD A = 6.41%

Correlation = -0.11

Standard Deviation of portfolio = 8.48%

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