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- 2011-7-11
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- 2016-4-21
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48,449 is technically correct. However, the 41,667 is obtained using the approximate rule that 99% of observations will fall within +/- 3 standard deviations of the mean.
Mean = 355000
3 std. dev. = (480000 - 355000) = 125000
1 std. dev = 41,666.67 |
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发表于 2011-7-11 18:38
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