组距 | ||||||
频数 | 2 | 3 | 4 | 5 | 4 | 2 |
分组 | 频数 | 频率 | 频率/组距 |
(40,50] | 2 | 0.02 | 0.002 |
(50,60] | 4 | 0.04 | 0.004 |
(60,70] | 11 | 0.11 | 0.011 |
(70,80] | 38 | 0.38 | 0.038 |
(80,90] | |||
(90,100] | 11 | 0.11 | 0.011 |
合计 |
A.2 | B.1 | C.8 | D.4 |
A.12,24,15,9 | B.9,12,12,7 | C.8,15,12,5 | D.8,16,10,6 |
© 2017-2019 超级试练试题库,All Rights Reserved.