Mom, what are you cooking now? It so nice.
A:smells
B:feels
C:sounds
D:tastes
你会写字吗?可以说:
已知一组数据:68,69,70,66,68,65,64,65,69,62,67,66,65,67,63,65,64,61,65,66共20个,则落在64.5~66.5这一小组的频数是____。