The average population density of the world is 47 persons per square mile.

世界平均人口密度为每平方英里47人。

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The technical definition of variance is the random variable's second central moment, the weighted average of the square of the differences from the expected value.

3方差的专业定义是随机变量的二次中心矩，与期望值之差的平方的加权平均值。

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In Shanghai, the average residential price for October was 16,954 yuan per square meter, up 22% since January.

在上海，10月份的平均住房价格为16,954元，自1月份以来上涨了22%。

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The scientists say the average Arctic sea ice extent last month was about five million square kilometers.

VOA: special.2009.10.27

The study found an average ice cover of about fifteen million square kilometers in March.

VOA: special.2009.05.05

Since your boss, not you, controls how much sporty space you have around your desk, you might not be surprised to learn that the average square feet allocated per worker hasn't changed in two decades.

FORBES: Magazine Article

This strategy is being pursued in tandem with opening smaller-sized mobile stand-alone stores which increase average revenue per square feet, a key performance measure for this industry.

FORBES: Best Buy Continues To Diversify By Selling Geek Squad Services

That compares with an average of 87 per square mile nationwide.

WSJ: A One-Horse Town Down to Two People