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问答题
问答题
问答题
平均废品率=1.63%
单项选择题
A.80
B.200
C.20
D.100
单项选择题
A.80
B.0.40
C.155
D.75
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