6. The blood groups of 200 people is distributed as follows: 50 have type A blood, 65 have B blood, 70 have O blood, and 15 have type AB blood (this is NOT a mixture of A and B blood). If a person...

6. The blood groups of 200 people is distributed as follows: 50 have type A blood, 65 have B blood, 70 have O blood, and 15 have type AB blood (this is NOT a mixture of A and B blood). If a person from this group is selected at random, a) What is the probability that this person has O blood?