My Math Forum Interpolating (I think?) from a bell curve.

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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 = bell-curve) 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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