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>> Well if the mean is 60 and the standard deviation is 13, one standard
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deviation below the mean would be 60 minus 13. 60 minus 13 is 47. So here's 60,
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the mean, and we go back 13, and this value is 47. Two standard deviations above
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the mean would be 86, because we go up 13 for one standard deviation and another
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13 for two standard deviations. And finally, the mean minus two standard
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deviations would be 60 minus 13 minus 13, which is 34.