题目内容

观察下面表格:

(1)完成表中的频率分布表;

(2)根据表格,画出频率分布直方图;

(3)估计数据落在[10.95,11.35)范围内的概率约为多少?

分组

频数

频率

[10.75,10.85)

3

[10.85,10.95)

9

[10.95,11.05)

13

[11.05,11.15)

16

[11.15,11.25)

26

[11.25,11.35)

20

[11.35,11.45)

7

[11.45,11.55)

4

[11.55,11.65)

2

合计

100

(1)频率依次为:0.03,0.09,0.13,0.16,0.26,0.20,0.07,0.04,0.02,1.00.

(2)

(3)0.75


解析:

(1)频率依次为:0.03,0.09,0.13,0.16,0.26,0.20,0.07,0.04,0.02,1.00.

(2)频率分布直方图如图所示

(3)数据落在[10.95,11.35)范围的频率为

0.13+0.16+0.26+0.20=0.75.

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