By using Excel or Google Sheets to create impactful graphs, you'll be able to captivate your audience, facilitate meaningful discussions, and drive home the key points of your presentation.

Microsoft Excel 2010 provides a formula for calculating the average value from multiple worksheets in a workbook. Before you apply this formula, check that each worksheet is formatted the same way.

A complex Excel 2007 workbook could require multiple sheets. By default, Microsoft provides three sheets on each workbook, but you can add as many as you need.

Want to know how to create a scatter plot in Excel? Here's a guide on how we created a simple chart based on performance numbers.