Add average data horizontally into existing chart

[Erin]

Can anyone help me add a single cell's data (average for a row of data)
across an existing column chart? I just want that one cell's data to string
straight across the whole chart. not sure if it'd even possible??

 

[Mike Alexander]

Hi Erin,

Check out this video

http://www.datapigtechnologies.com/flashfiles/addavgline.html

 

[Shane Devenshire]

Hi,

1. Assume you X-axis data is in A2:A11 and the Y-axis data B2:B11, in C2
enter the formula
=AVERAGE(B$2:B$11)
2. copy this formula down to C11.
3. Highlight the range C2:C11 and click Copy.
4. Right-click the border of the chart and choose Paste
5. Select the new series and choose Chart, Chart Type, Line...

Although it is possible to plot this line with just the two end point, its
trickier than the above technique and really serves no purpose.