Posted by **ALFREDA** on Thursday, April 19, 2012 at 3:07pm.

I need to find the class midpoint, boundaries and class with for the following problem

Tar Cigarette Filter Frequency

2-5 2

6-9 2

10-13 6

14-17 15

I did the midpoint and boundaries

3.5 5.5

7.5 9.5

11.5 13.5

15.5 17.5

But for the width I got an answer of 1.25 can someone please let me know if I have the problem correct.

- statistics -
**MathGuru**, Thursday, April 19, 2012 at 7:03pm
Example:

Class limit is 11 - 20

Class midpoint is (11 + 20)/2 = 15.5

Class boundary is 10.5 - 20.5 (.5 below and .5 above)

Class width is 20.5 - 10.5 = 10

I hope this example will help.

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**ALFREDA**, Thursday, April 19, 2012 at 11:04pm
No it didn't I just wanted to know if I was correct that's all thanks for nothing mathguru

- statistics -
**MathGuru**, Friday, April 20, 2012 at 7:12pm
The example was meant to show you how to do the problem without doing it for you.

You are correct on the midpoints.

You are missing the lower class boundaries.

You are missing the class widths for each class.

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