A student achieves an 82 on the first test in a statistics course. From this, she assumes that her average at the end of the semester (after other tests) will be about 82. This is an example of （）.

Simon Arnett, Director of Human Resources, is exploring the causes of employee absenteeism at Buderim Bottling during the last operating year (1 January 2005 to 31 December 2005). The average number of absences per employee, calculated from the personnel data of all employees, is a （）.

对全国各铁路交通枢纽的货运量、货物种类等进行调查，以了解全国铁路货运概况。这种调查属于（）

If data are grouped into intervals and the number of items in each group is listed, this could be called a （）

The number of class intervals in a frequency distribution is usually between （）.

在组距数列中，下限就是（）

如果居民按报告期价格购买商品需多支出40万元，报告期商品销售额为200万元，则价格指数为（）

某企业2018年技术工占50%，2019年新招收了一批学徒工，使学徒工的比重增加了10%。假定全厂各级工资水平均无变化，则2019年职工总平均工资将（）

Descriptive statistics deals with methods of（）

企业生产一种产品需顺次经过四个车间，这四个车间的废品率分别为1.5%、2.0%、2.0%和1.0%。该企业生产这种产品的平均废品率是多少？