Creating an"Average" Line in a Scatter Graph

[Guest]

I have created a scatter diagram from two columns of data. How do I
superimpose or generate a glide slope line that represents the average
scatter density? Thanks

 

[David Biddulph]

If you mean a trendline, Chart menu, and Add Trendline.

 

[Bernard Liengme]

See
http://www.andypope.info/charts/averageline.htm
or one of the other 1.19 x 10^6 hits that Google gives with the search term
<excel chart add line>
best wishes