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People with blood type O- are sometimes referred to universal donors as their blood can be...

People with blood type O- are sometimes referred to universal donors as their blood can be used for all recipients. About 9% of the Australian population have blood type 0-. Suppose blood donors have the same distribution of blood types as the Australian population.

  1. In any 10 donors chosen at random, what is the probability that exactly 3 will have O- blood?  

  1. In any 10 donors chosen at random, what is the probability that between 1 and 4 inclusive will be of blood type O-? Show any working.
  1. In any 10 donors chosen at random, what is the most likely frequency of blood type O-? Provide some evidence to support your answer.

  1. On average, how many of the next 10 donors would you expect to be O-? Show any working.
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Answer #1

C) most likely frequency is the mode

Mode of binomial distribution issl

=(n+1)*p

=11*0.09

=0.99

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