If three people are selected at random blood type what is the probability atleast one of them will be type O?

To find the probability that at least one of three randomly selected people has blood type O, we first calculate the probability that none of them have type O. Assuming the distribution of blood types is approximately 45% type O, the probability that one person does not have type O is 55% (or 0.55). Thus, the probability that none of the three have type O is (0.55^3 \approx 0.1664). Therefore, the probability that at least one of them has type O is (1 - 0.1664 \approx 0.8336) or about 83.36%.