A sample of 2000 individuals is distributed according to eye

A sample of 2000 individuals is distributed according to eye color and the presence or absence of a certain opthalmic trait as follows:

In a random selection of an individual from the study population, what is probability that the person has no blue eyes and the trait is absent?

5/6

1/2

2/7

none of these

Solution

the required probability is = 1000/2000=1/2