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March 10th, 2015, 02:46 PM  #1 
Newbie Joined: Mar 2015 From: canuckland Posts: 1 Thanks: 0  Interpolating (I think?) from a bell curve.
1100  5% 1500  10% 2000  25% 2250  50% 2731  75% 3200  90% 3900  95% 4100  99% 5800  99.993% 7728  99.999991% I want to find what 4900 correlates to. I've tried a bunch of things but apparently everything I do is wrong or doesn't seem to match up. 
March 10th, 2015, 08:20 PM  #2 
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms 
The points don't match up to a normal (=guassian = bellcurve) distribution very well. If I ignore that and take the two closest points, 99% is 2.326 standard deviations up and 99.993% is 3.808, so interpolating 4900 as 9/17 of the way from 2.326 to 3.808 gives 3.023 standard deviations up, so 99.875% or so.


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bell, curve, interpolating 
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