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| | Mean and Median |
 | | The median of a series is that point which so divides it that half the quantities are on one side, half on the other. |
| | The median often better expresses the common-run, since it is not, as is the mean, affected by an excessively high or low figure. |
| | Mean streets: the median of a size-biased sample and the population mean. |
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