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14 July, 17:07

In a large population, 69% of the people have been vaccinated. If 4 people are randomly selected, what is the probability that At least one of them has been vaccinated?

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  1. 14 July, 17:56
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    0.991

    Step-by-step explanation:

    Let Q be probability none of the 4 are vaccinated.

    Let P be probability that at least 1 is vaccinated.

    P = 1 - Q

    Now if 69% are vaccinated, then 31% are not vaccinated.

    Thus any given person has a probability of 0.31 of not being vaccinated.

    Q = (0.31) ^4 = 0.00924

    P = 1 - 0.00924 = 0.991
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