Creating average as a line in line and bar chart

[WTAS80486]

I have calculated Mean by site for all assets under one site

Mean = DIVIDE('Table'[Hours],Table[F]) , Hours and F are measures in Table

This gives Mean for each site

Now I need to create a line for Average on this chart which would give total Hours for all 4 sites combined/Total F for all 4 sites combined ( to comapre site average with total average) 

Using the same Mean as line dosent help

[daXtreme · Accepted solution]

// NOTE: Measures should never be preceded by
// the table name they sit in. On the other
// hand, columns should always be preceded
// with the name of the table they belong to.

Mean = DIVIDE( [Hours], [F] )

// Assuming that your measures aggregate
// correctly...
[Overall Mean] = 
  CALCULATE(
    [Mean],
    ALLSELECTED( T[Site] )
  )
  
// or if the above doesn't work (but it should)...

[Overall Mean] = 
DIVIDE(
  CALCULATE(
    [Hours],
    ALLSELECTED( T[Site] )
  ),
  CALCULATE(
    [F],
    ALLSELECTED( T[Site] )
  )
)

[WTAS80486]

@daXtreme Thank you!