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beesticles - 9:51 am on Oct 9, 2007 (gmt 0)
Eg. KW1: 1000 imps, 2.5 avg pos Total = ((1000 * 2.5) + (2000 * 3.8)) / 3000 = 3.4
Weight it by the number of impressions that each keyword received.
KW2: 2000 imps, 3.8 avg pos