Of the volunteers donating blood in a clinic 80 have the, Ask an Expert

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Of the volunteers donating blood in a clinic, 80% have the Rhesus (Rh) factor present in their blood.

a If five volunteers are randomly selected, what is the probability that at least one does not have the Rh factor?

b If five volunteers are randomly selected, what is the probability that at most four have the Rh factor?

c What is the smallest number of volunteers who must be selected if we want to be at least 90% certain that we obtain at least five donors with the Rh factor?

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Statistics and Probability, Statistics

Category:- Statistics and Probability
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