the ages of students in a computer class are 14, 13, 14,15,14,35,14. Decide which measure of center(s) best describes the data s
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The 'i' should go in front of the square root, not inside it.
So the answer should be
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The way they wrote the expression is bit misleading as it might imply that the 'i' is under the square root. However the square root ends after the "5". It might be better to say
so there is clearer separation. But sticking the "i" in front is also a valid option.
side note: the plus minus part is already handled so there's no need to worry about that.