Theoretically, when you multiply the probability of a race coming up with less performance
Risk is if the number is higher and the yield of 1,55 is more risk because it is smaller
the number is 1.2865 that's what the theory says.
The yield product on the probability of occurrence, gives the average refund, which can be negative.
Eg 60% probability on odds 2,00 = 1,20 = For every euro, I win 20 minutes.
50% probability on odds 1,80 = 0,90 = For every euro, I lose 10 minutes.
It has nothing to do with the possibility of occurrence.