... mean of population 总体均数 ; 人口平均值 ; 总体均值 mean effective population size 平均有效种群大小 arithmetric mean of population 总体算术均数 ...
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这些估算的平均值表明，到2085年，全球人口将超过100亿。
The average of these estimates suggests that the global population will cross 10 billion by 2085.
和欧洲7%的平均值相比，西班牙目前的失业率为13%，失业人口超过300万。
The jobless rate is now 13%, over 3m, compared with a European average of 7%.
人口均值经常写成“x-条形柱”，如果你有一个样本有n个观测者，是从 i=1到n和的xi/n，这是平均值。
The population mean is often written "x-bar." If you have a sample with n observations, it's the summation i = 1 to n of xi/n--that's the average.
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