Blood Types: Part A The most useful blood type for transfusions is blood type O- or "O-negative", because people with this blood type are considered "universal donors" as this blood won't be rejected by the recipient. Only 7.0% of the population of Canada have a blood type of O-negative, in other words only 7 out of 100 people have this blood type in Canada. If you walked down the street and spoke with people completely at
Blood Types: Part A
The most useful blood type for transfusions is blood type O- or "O-negative", because people with this blood type are considered "universal donors" as this blood won't be rejected by the recipient. Only 7.0% of the population of Canada have a blood type of O-negative, in other words only 7 out of 100 people have this blood type in Canada.
If you walked down the street and spoke with people completely at random, what is the expected number of people you would need to talk to until you found someone with this blood type? What is the standard deviation for the number of people you would need to talk to until you found someone with this blood type?
Show your calculations below and make sure to clearly indicate both the expected number of people as well as the standard deviation, each rounded to 2 decimal places.
Blood Types: Part B
Given that 7.0% of the population of Canada have blood type O-negative, calculate the probability that you would ask exactly 9 people at random about their blood type before person number 9 would have this blood type.
Write your answer as a percentage rounded off to 2 decimal places.
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