A.5,10,15 | B.3,9,18 | C.3,10,17 | D.5,9,16 |
A.不能确定 | B.①②同样省钱 | C.②省钱 | D.①省钱 |
A.180 | B.240 | C.480 | D.720 |
A.5,10,15,20,25,30 | B.2,14,26,28,42,56 |
C.5,8,31,36,48,54 | D.3,13,23,33,43,53 |
分组 | 45~55 | 55~65 | 65~75 | 75~85 | 85~95 |
频数 | | | | | |
频率 | | | | | |
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