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
单项选择题 The number of class intervals in a frequency distribution is usually between （）.
单项选择题 A cumulative frequency polygon is also called （）.
单项选择题 If the individual class frequency is divided by the total frequency, the result is the （）.
