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You can use the standard normal distribution curve. let me see if I can find one

from http://www.oswego.edu/~srp/stats/6895997.htm
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What about the next one, where the times are 40 and 70?

between 40 and 70, add up the percentages between those numbers

Yes that's what I meant. That's right

Ok, I think I got it now. Thank ya'll!