问题 选择题 已知一个样本:23,24,25,26,26,27,27,27,27,27,28,28,28,29,29,30,30,31,31,32,那么频数为8的范围是( )A.24.5~26.5B.26.5~28.5C.28.5~30.5D.30.5~32.5 答案 答案:B