单项选择题
A cumulative frequency polygon is also called （）.
A.an ogive B.a histogram C.a frequency polygon D.a stem and leaf plot
单项选择题 If the individual class frequency is divided by the total frequency, the result is the （）.
单项选择题 If data are grouped into intervals and the number of items in each group is listed, this could be called a （）
单项选择题 Which of the following is not the goal of descriptive statistics?（）
