A:(2,0)
B:(0,2)
C:(1,0)
D:(0,1)
There ____ (be) few students playing in the playground because of the coming exam, will there?
30,42,41,36,44,40,37,37,25,45,29,43,31,36,49,34,33,43,38,42,32,34,46,39,36.
根据上述数据得到样本的频率分布表如下:
分组
频数
频率
25,30
3
0.12
(30,35
5
0.20
(35,40
8
0.32
(40,45
n1
f1
(45,50
n2
f2