How do you find the mid point of a data class?

Question

I know that if the class has two outer limits, e.g. !-3 then you just add the two limits and divide by 2, but if you have one without and upper limit, e.g. 60+ how would you work out the mid point?

Answer 1

Hi,
Your question is not exactly clear to me (I think you may have left something out), but one way to find the midpoint is to take 1/2 the class width and add it to the lower class limit. By definition a class must have a class width, otherwise it is not a class. If you just have a collection of data; then you calculate things like the median, the mode, and the mean.
The median which is a sort of midpoint, is the number that is in the middle. That is, there are an equal number of data points on each side, or in the case where the number of data points is even it's the sum of the two middle points divided by 2.

Hope this helps some.
FE