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Under a normal bell curve, 68.26% of the time, the actual rate of return will be...

Under a normal bell curve, 68.26% of the time, the actual rate of return will be within +1 and -1 deviations of the expected rate of return, r^, that is, the actual rate earned will be within one deviation of the expected rate, OR, no greater than_________% and no less than__________%, 68.26% of the time.

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