# Thread: Constructing a frequency distribution. Where's my mistake?

1. ## Constructing a frequency distribution. Where's my mistake?

Okay, so I have to construct a frequency distribution. My highest value is 25.3 and my lowest is 20.5. I have no idea what number of classes I want to pick and when I keep doing this it's not coming out right.

For example I did this : 25.3- 20.5/8 = .6

And this is what I got :

20.5- 21
21.5- 21.6
21.7- 22.2
22.3- 22.8
22.9- 23.4
23.5- 24
24.1- 24.6
24.7- 25.2

2. Originally Posted by gnarlycarly227
Okay, so I have to construct a frequency distribution. My highest value is 25.3 and my lowest is 20.5. I have no idea what number of classes I want to pick and when I keep doing this it's not coming out right.
For example I did this : 25.3- 20.5/8 = .6
And this is what I got :
20.5- 21
21.5- 21.6
21.7- 22.2
22.3- 22.8
22.9- 23.4
23.5- 24
24.1- 24.6
24.7- 25.2
$\displaystyle \dfrac{ 25.3- 20.5}{8} = .6$

0--> 20.5
+0.6
1--> 21.1
+0.6
2--> 21.7
+0.6
3--> 22.3
+0.6
4--> 22.9
+0.6
5--> 23.5
+0.6
6--> 24.1
+0.6
7--> 24.7
+0.6
8--> 25.3

Your groupings should be more like this:
20.5 - 21.1
21.1 - 21.7
21.7 - 22.3
22.3 - 22.9
22.9 - 23.5
23.5 - 24.1
24.1 - 24.7
24.7 - 25.3