A:16
B:18
C:22
D:24
—Too much homework has made me tired these days, Mr. Wang.
—That's true. But a small tree won't grow into a big tree it experiences lots of winds and rains.
某交警部门对城区上下班交通情况作抽样调查,上下班时间各抽取12辆机动车的行驶速度(单位:km/h)作为样本进行研究,做出样本的茎叶图,则上班、下班时间行驶速度的中位数分别是( )