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【单选题】
某连续变量分为五组,第一组为40-50, 第二组为50- 60,第三组为60-70,第四组为70-80,第五组为80以上,依据规定( )
A.
50在第一组，70在第四组
B.
60在第二组，80在第五组
C.
70在第四组，80在第五组
D.
80在第四组，50在第二组
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