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

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410

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

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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

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