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(9%-13.00%)^2(0.15)+(13%-13.00%)^2(0.70)+(17%-13.00%)^2(0.15)=

 Mar 21, 2016
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(9%-13.00%)^2(0.15)+(13%-13.00%)^2(0.70)+(17%-13.00%)^2(0.15)=43/20=2.15

 Mar 21, 2016

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