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Blood type AB is found in only 3% of the population†. If 240 people are chosen at random, find the probability of the following. (Round your answers to four decimal places.)
(a) 5 or more will have this blood type
(b)between 5 an 10 will have this blood type

  • statistics -

    Here's one way to do this problem:

    n = 240
    p = .03
    q = 1 - p = 1 - .03 = .97

    For (a), you will need to find P(0) through P(4). Add together, then subtract the total from 1 for the probability.

    I'll let you try (b).

    You can use a binomial probability table or calculate by hand using the following formula:

    P(x) = (nCx)(p^x)[q^(n-x)]

    I hope this will help get you started.

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