172,193,172,196,196,175,175,193,190,181,184,187,181,187,190,181,184,187,187,184,187,181,187,184,181,187,184,184,184,187,181,187,184,187,181,187。
36个兵俑高度的频数表
组别/ cm
组中值/cm
频数
频率
170.5~173.5
172
173.5~176.5
175
67,68,66,70,68,67,70,85,86,100,88,85,70,68,67,67,70,72,78,68,70,67,66,67,68,69,70,72,68,67。
“字番2号”番茄挂果数量统计表
挂果数量x(个)
频数(株)
25≤x<35
6
0.1
35≤x<45
12
0.2
45≤x<55
a
0.25
55≤x<65
18
b
65≤x<75
9
0.15
请结合图表中的信息解答下列问题:
10, 11, 13, 9, 11, 15, 8, 12, 11, 14,
7, 14,12, 15, 13,15, 13,10, 16, 14.
以2cm为组距制作频数表,并绘制频数直方图.
组别(cm)
组中值(cm)
6.5~8.5
8.5~10.5
10.5~12.5
12.5~14.5
14.5~16.5