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Check out this informative video tutorial from Apple on how to create formulas with Quick Formula in Numbers '09. iWork '09, the office productivity suite from Apple, is the easiest way to create documents, spreadsheets, and presentations. Writing and page layouts are easy in Pages. Numbers gives you simple ways to make sense of your data.
Observe the result in the cell you entered the formula in. The average, or arithmetic mean, is determined by finding the sum of the numbers in the cell range (80) and then dividing the sum by how many numbers make up the range (10), or 80 / 10 = 8. Select âAVERAGEâ from the âSelect a function:â list in the Insert Function dialog and click OK. 2  Enter the range âA1:A10â in the Number 1 field of the Function Arguments dialog and click OK. 3  Enter an equals sign (=) in the function bar to the right of the function symbol.