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(10-11)^2/11 + (11-10.5)^2/10.5 + (12-9)^2/9 + (13-15.5)^2/15.5
(10-11)^2/11 + (11-10.5)^2/10.5 + (12-9)^2/9 + (13-15.5)^2/15.5
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