Question: How does [(10% - 6.67%)^2 + (15% - 6.67%)^2 + (-5% - 6.67%)^2] / 3 equal to 108.2%. My Calculator is giving a different answer.

How does [(10% - 6.67%)^2 + (15% - 6.67%)^2 + (-5% - 6.67%)^2] / 3 equal to 108.2%. My Calculator is giving a different answer. Also if we take sqrt of variance for std, why do we take sqrt(116.89%) instead of sqrt(108.2%)

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