Simple average is ok but histograms of your CPC data can help to better understand outlier data points. This is part one of a three-part series about Bing’s data distribution tools.

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http://feeds.searchengineland.com/~r/searchengineland/~3/aCipder5Icc/bing-histograms-reveal-better-business-intelligence-metrics-with-data-distributions-308343