Mattio,

You should do it for each fav. ie 1/$2 + 1/$3 = 0.83333

But from your figures I assume is over 70 races so we can assume odds of 264.6/70 = $3.78 per fav. This means there were 1/3.78 * 70 = 18.52 winners.

If these are tab prices I would be very careful about laying them as betfair prices are not always X% higher. Sometimes they are lower, mostly higher, and sometimes the favs are different.

If they are tab prices then its likely the number of winners should be 1.15% higher which would be 21.3 winners from the 70 races.

Again its based on the assumption this is 70 races for the figures you gave me.

Also my maths may be wrong so always double check it.

Not sure this helps Mattio

These are some actual figures from a laying system i have been doing.
All were favorites on betfairat sometime in betting

From 20/3/2010 to 20/4/2011

Bets 2013

Accidents 510

Av price 3.7

Laying to liability of $2000

More than 90 % were actually Layed

The balance were all documented(They werent layed because of phone or internet problems)

75%sr is not very good in laying.

__________________
One Drive

"If the corporates are treating you poorly , just go elsewhere."
"If they need you , they will soon find out."
"If you need them , you will soon find out." --moeee
_______________________________________________