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

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单项选择题

One rule that must always be followed in constructing frequency distributions is that （）.

A.the number of classes must be less than 10
B.each data point can only fall into one class
C.the width of each class is equal to the range
D.the number of intervals must be an odd number

单项选择题

One advantage of a stem and leaf plot over a frequency distribution is that （）.

A.it contains more class intervals
B.the values of the original data are retained
C.the class midpoints are used as the stem
D.the class midpoints are used as the leaf