Suppose that in a certain population 45% of people have type O blood. A researcher selects people at random from this population. What is the probability that there is at least one person with type O blood among the first 6 people checked? a) 0.0277 b) 0.0226 c) 0.0083 d) 0.0503 e) 0.9723 Suppose that the probability of contracting HIV in a country is small, with p about 0.0005 for a new case in a given year. Suppose that that the number of new cases can be modelled by a Poisson distribution. In a small town of 8000 people: What is the expected number of new cases? a) 2 b) C) 8 e) 10 Approximate the probability that there will be at least one new case of HIV next year in this town. a) 0.481 b) 0.131 c) 0.981 d) 0.831 e) 0.501 Find the closest value to the probability that during the next 2 years, there will be exactly one new case. a) 0.011 b) 0.032 c) 0.021 d) 0.003 e) 0.008