单项选择题
A.a graph of a frequency distribution
B.a running total of the frequencies in the classes
C.the proportion of the total frequencies which fall into each class
D.a very cloudy picture of the frequencies
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？（）
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 （）.