已知数据:25,22,21,25,19,26,22,28,24,27,25,26,26,27,29,28,36,24,25,30.在列频数分布表时,如果取组距为3,那么应分成()组,最低分组区间为()


已知数据:25,22,21,25,19,26,22,28,24,27,25,26,26,27,29,28,36,24,25,30.在列频数分布表时,如果取组距为3,那么应分成()组,最低分组区间为()

A.5

B.6

C.18.5~21.5

D.19~22

正确答案:6;18.5~21.5