American red crossonly 4 of people have type ab blood a, Ask an Expert

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American Red Cross

Only 4% of people have Type AB blood. A bloodmobile has 12 vials of blood on a rack. If the distribution of blood types at this location is consistent with the general population, what's the probability they find AB blood in:

a) None of the 12 samples?

b) At least 2 samples?

c) 3 or 4 samples?

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