I need help with part C

According to the American Red Cross, about one out of nine people in the U.S. have Type B blood. Suppose the blood types of people arriving at a blood drive are independent. In this case, the number of Type B blood types that arrive roughly follows the Poisson distribution.

• Part (a)
• If 100 people arrive, how many on average would be expected to have Type B blood? (Round your answer to two decimal places.)
• Part (b)
• What is the probability that over12people out of these 100 have type B blood? (Round your answer to four decimal places.)
• Part (c)
• What is the probability that more than21people arrive before a person with type B blood is found? (Use the exponential distribution. Round your answer to four decimal places.)