Answer to Question #330061 in Statistics and Probability for aaeron

Question

The blood groups of 200 people are distributed as follows: 40 have type A blood, 75 have type B blood, 60 have type O blood, and 25 have type AB blood. If a person from any of the group is selected at random, what is the probability that this person has an O blood type? How about the AB blood type?

Answer 1

$P(O)=\frac{60}{200}=0.3.$

$P(AB)=\frac{25}{200}=0.125.$