New to Microsoft Excel? Looking for a tip? How about a tip so mind-blowingly useful as to qualify as a magic trick? You're in luck. In this MS Excel tutorial from ExcelIsFun, the 97th installment in their series of digital spreadsheet magic tricks, you'll learn how to use the AVEDEV function to measure the spread (variation) in a data set. Also see the STDEV function and learn how to measure whether a mean represents its data points fairly.