Excel makes it simple to change a few variables and see the way it affects the most important thing. MS Excel, on the flip side, can do all of the things Word might not. Fortunately, Microsoft Excel has a built-in function designed to compute the mean. It is a favorite spreadsheet program used for organizing tables, budgets and keeping track of all sorts of data. Thus, the very first step would be to double check Excel's listing of native functions to see whether there is already one that can do the calculations you are considering.