摘要:7.D 8.C 9.B 10.C 11.B 12.A
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已知样本12,7,11,12,11,12,10,10,9,8,13,12,10,9,6,11,8,9,8,10,那么频率为0.25的样本的范围是
[ ]
A.
[5.5,7.5]
B.
[7.5,9.5]
C.
[9.5,11.5]
D.
[11.5,13.5]
已知样本10,8,6,10,8,13,11,10,12,7,8,9,10,11,12,9,10,11,9,12,那么频率为0.2的范围是
[ ]
A.5.5~7.5
B.7.5~9.5
C.9.5~11.5
D.11.5~13.5
已知样本:12,7,11,12,11,12,10,10,9,8,13,12,10,9,6,11,8,9,8,10,那么频率为0.35的样本范围是( )
A.[5.5,7.5) B.[7.5,9.5)
C.[9.5,11.5) D.[11.5,13.5)
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已知样本7,10,14,8,7,12,11,10,8,10,13,10,8,11,8,9,12,9,13,20,那么这组数据落在8.5~11.5的频率为( )
A.0.5 | B.0.4 | C.0.3 | D.0.2 |