| 单词 | median |
| 释义 | median A measure of the mid-point of a set of numbers. The median of a set of N numbers, x1, x2,…, xN is found as follows: arrange the numbers in increasing, or decreasing, order of size. If N is odd, the median is the central number, the (N + 1)/2 th (whichever end one counts from). If N is even, the median is defined as the mean of the central pair, that is the N/2 th and the (N/2) + 1 th (again, whichever end one counts from). The median can always be calculated, whether the xi are positive, zero, or negative. A merit of the median as a statistic describing, for example, household income, is that it is very insensitive to extreme figures caused by measurement errors or mistyping the data. |
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