finite math

Among 26-31 year old, 29% say they have written an editorial letter while under the influence of peer pressure. Suppose six 26-31 year old are selected at random. (a) that at least one has not written under the influence of peer pressure. (b) what is the probability of that at least one has written an editorial letter while under the influence of peer pressure.

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asked by carol
  1. is part (a) a given condition or you're expected to calculate the said event?

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  2. it is a given

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    posted by carol
  3. If at least one has not written, then there are only 5 to consider.

    p=0.29
    q=(1-0.29)=0.71

    P(at least one out of 5)
    =1-P(none out of 5)
    =1-q^5
    =1-0.18
    =0.82

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