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How to Use the AVERAGEIF and AVERAGEIFS Functions in Excel

Excel's AVERAGEIF and AVERAGEIF functions let you find the average of a set of data. However, where they differ from the more ...
Ars Technica

WeekNum Relative Date in Excel??

Does anyone know of a way to use the WEEKNUM function but to have it display the week number relative to a specific date? For example, If my column of dates starts at May 7th, where I would like May ...