| 单词 | mean |
| 释义 | mean The unweighted average of a set of numbers. The arithmetic mean, μx, of the numbers xi, i = 1, 2,…, N, is given by their sum divided by N, so μx = (∑i xi)/N. The geometric mean is defined as the Nth root of the product of the numbers, that is (∏i xi )1/N. The logarithm of the geometric mean of the numbers xi equals the arithmetic mean of their logarithms. The arithmetic mean can be calculated for any set of numbers, whether positive, zero, or negative; the geometric mean exists only when they are all non-negative. See also: arithmetic mean, and geometric mean |
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