论文部分内容阅读
在实际生活中,常常利用样本估计总体的方法来解决有关问题,进行决策.一、用样本的“三数”(平均数、众数、中位数)估计总体的“三数”例1(2014年宁波卷)作为宁波市政府民生实事之一的公共自行车建设工作已基本完成,某部门对今年4月份中的7天进行了公共自行车日租车量的统计,结果如图1.(1)求这7天日租车量的众数、中位数和平均数;(2)用(1)中的平均数估计4月份(30天)共租车多少万车次;
In real life, the sample estimation method is often used to solve the problems and make decisions. First, we use the sample “three numbers ” (average, mode, median) to estimate the overall Example 1 (Ningbo Vol. 2014) The construction of public bicycles, one of the people’s livelihoods in Ningbo City Government, has basically been completed. A department made statistics on the daily bike rental amount of public bicycles for seven days in April this year. The results are shown in Figure 1 (1) Calculate the mode, median and average number of car rentals for these 7 days; (2) Estimate the total number of car trips in April (30 days) using the average in (1);