三棱锥A-BCD中,AC⊥BD,E,F,G,H分别是AB,BC,CD,DA的中点,则四边形EFGH是( )
25,21,23,25,27,29,25,24,30,29,26,23,25,27,26,22,24,25,26,28.
对这些数据编制频率分布表,其中24.5-26.5这一组的频率为( )
- Who is she?
-She's my sister.