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Suppose 48% of the general population of thw world has blood type O, 27% blood type A, and 23% blood type B.

a. what is the probability that someone has type AB blood( assume that there are only four blood types?

b. Of tjere are 30 people in a room,how many would you expect to have type A blood?

I got for the first answer a 2/27= 0.07 b. 27/30=0.9, I am not sure if this correct.

  • math -

    1-.48-.27-.23 = .02, so 2% have AB
    That is, types O,A,B account for 98% of the population.

    30 * 27% = 8.1, so I'd expect 8

  • math -

    ok, I understand now thanks!

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