How is this formula derived
This seems to give me the average ratio of the slope
I know this is one, but why is it needed?
I'm sorry it should be .
As far as the x with the bar over it, I just don't know the Latex command for that, so I subbed in the o figuring everyone would understand. I still amm unclear why it is needed. The second part is just a factor I pulled out of the slope equation from above.