从所有的区域和它们的估计人口列表中得到总分组数，再将总分组数除以30得到分组抽样间隔k。
The total number of clusters, drawn from a list of all sections and their population estimates, is divided by 30 to obtain the cluster interval K.
据估计，大约12万吨的进口粮食养活了大约60万人，约占荷兰人口的三分之一。
According to estimates, about 120,000 tons of imported grain fed about 600,000 people: that is about a third of the Dutch population.
按照对目前人口趋势的最保守估计，到那时人口将增加约30亿人。
Applying the most conservative estimates to current demographic trends, the human population will increase by about three billion people by then.
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