The U.N.Fund for Population Activity says more than 600,000 African women already suffer from obstetric fistula with as many as 30,000 new cases each year.

VOA: standard.2009.12.23

They divide by n-1 to make it an unbiased estimator of the population variance, but I'm just going to show it in a simple way here.

当除以n-1表示的是对总体的,无偏估计,我在这里只是说的简单一点

耶鲁公开课 - 金融市场课程节选

Authorities there must buy new equipment." The U.N.agency reports mortality rates in Gaza are about 30 percent higher than among the Palestinian population in the West Bank.

VOA: standard.2010.06.01

He later joined the U.N. population agency and brought in Laquian.

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"With only a small variation in fertility, particularly in the more populous countries, the total could be higher: 10.6 billion people could be living on Earth by 2050 and more than 15 billion in 2100, " says the Population Division of the U.N.

CNN: U.N.: World can 'thrive' as population reaches 7 billion

The U.N. estimates the Rohingya population in Myanmar at 800, 000 people.

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