单项选择题
Which of the following is best to show the percentage of a total budget that is spent on each category of items？（）
A.histogram B.ogive C.stem and leaf chart D.pie chart
单项选择题 One rule that must always be followed in constructing frequency distributions is that （）.
单项选择题 One advantage of a stem and leaf plot over a frequency distribution is that （）.
单项选择题 The number of class intervals in a frequency distribution is usually between （）.
