It has been estimated that in 70 of the fatal accidents invo

It has been estimated that in 70% of the fatal accidents involving two cars, at least one of the drivers is drunk. If you hear of a two-car fatal accident, what odds should you give a friend for the event that at least one of the drivers was drunk?

Solution

As per estimates, in 70% of the fatal accidents involving two cars, at least one of the drivers is drunk. It also means that in 30 % of such cases, neither of the car drivers is drunk. Now, 70 % = 70/100 = 7/10 and 30 % = 30/100 = 3/10. Therefore, if we hear of a two-car fatal accident, the odds for the the event that at least one of the drivers was drunk are 7/10:P 3/10 = 7: 3.