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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.
Column A uses the formula, =(A2+A3+A4+A5)/4, to find the average. Be careful when choosing AVERAGEIF() because it ignores empty cells and that might not be what you want either. If you need a formula that that doesn't ignore empty cells or if you're still using Excel 2003, you can use a formula in the following form: