一个容量为100的样本,其数据的分组与各组的频数如下:
组别 |
(0,10] |
(10,20] |
(20,30] |
(30,40] |
(40,50] |
(50,60] |
(60,70] |
频数 |
12 |
13 |
24 |
15 |
16 |
13 |
7 |
则样本数据落在(10,40]上的频率为( )
A.0.13 B.0.39
C.0.52 D.0.64
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