I need to understand part b. how did they get n(p) in other words, how did they go from p = F(n(p)) ......to n(p) see the attachment!
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That's just the quadractic equation. Let x be the percentile so p=F(x) or multiply by x and create a quad equation NOW solve for x and discard the bad solution.
Last edited by matheagle; Nov 6th 2009 at 11:36 PM.
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