1.
(2017·古冶模擬)
某小組5名同學(xué)在一周內(nèi)參加家務(wù)勞動的時(shí)間如表所示,關(guān)于“勞動時(shí)間”的這組數(shù)據(jù),以下說法正確的是( )
動時(shí)間(小時(shí)) | 3 | 3.5 | 4 | 4.5 |
人數(shù) | 1 | 1 | 2 | 1 |
A . 中位數(shù)是4,平均數(shù)是3.75
B . 眾數(shù)是4,平均數(shù)是3.75
C . 中位數(shù)是4,平均數(shù)是3.8
D . 眾數(shù)是2,平均數(shù)是3.8