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Statistics people: I need help understanding Index of Qualitative Variation.

We were given an example:

Catholics - 4
Protestants - 5
Jews - 6

From this it says that the Actual Differences are 74, the Maximum Possible Differences are 75 and the IQV should be .99.

I'm really not understanding what my course notes are trying to say, because I get an actual difference of 75 and a max difference of 125.

If you could help explain what I'm missing it would be a lot of help. If I can figure it out, I can do the last question on my assignment.
 
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