It is the horizontal line at the bottom of the chart.
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Excel does not automatically calculate and display the mean in a bar chart. You can add the mean following these steps:Enter your data points (EXAMPLE: A1:A23).In cell A24 (or whatever cell is at the bottom of your data), enter the formula =AVERAGE(A1:A23).Highlight all the cells (A1:A24) and use that as the data to create your chart.Format your chart as you like.Observe that the last entry in the chart will be the MEAN.If the bar chart already exists and you do not have access to the original in Excel, then you will need to add up all the values of all the bars and divide by the number of bars on the chart.
A column chart.
There are many charting options in Excel. When you choose your chart, select a 3D chart.
Excel does not have a specific chart area. You might be referring to the area within a chart where you can change the legend and other information. You will find chart tools on the Insert tab of the Excel 2007 ribbon.
A column chart.