S.O.S. Mathematics CyberBoard

I was asked a question today by a colleague I wasn't able to answer confidently and wanted a second opinion. Supposing a distribution of scores, if one is exactly one standard deviation away from the mean and I'm trying to determine how to apply a rule that categorizes scores as "within 1 SD", "between 1 & 2 SDs", etc... how would you categorize the specified score?

As always, thanks in advance.

--MF

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let:
a=b
ab=b^2
ab-a^2=b^2-a^2
a(b-a)=(b+a)(b-a)
a=b+a
a=2a
1=2