## Essentials of Statistics (5th Edition)

$5:2,\frac{7}{3},-0.9,\frac{456}{123}$ cannot represent a probability.
We know that $probability=\frac{number \ of \ good \ outcomes}{number\ of\ all\ outcomes}$ and therefore such value can only be at least 0 and at maximum 1. Therefore the values that are negative or more than 1 cannot represent a probability. Therefore the answers are: 5:2,$\frac{7}{3}$,-0.9,$\frac{456}{123}$.