Say you have a series of 10 wins from 30 races and 9 of the wins are priced at $2.50 but the tenth win is priced at $15

9 x $2.50 = $22.50
1 x $15 - $15
Total $37.50 /10 = average $3.75

If you used this average as a long term idea that you system could stay in profit you would be in trouble because you are relying on your system that produced a profit from one good return.

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