3 If sample 100 organisms and find that 25 of them are just

3. If sample 100 organisms and find that 25 of them are just red, 25 are just hairy, 25 are both hairy and red and 25 are yellow, what is the probability of being red given that you are already hairy?

Solution

P( Onnly Red) = 25; P( Only Hairy) = 25; P( Red and Hairy) = 25; P(yellow) = 25

P( being red given that you are already hairy) = P( red and Hairy) / P( hairy) = 25 / 50 = 1/2 = 0.5