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27 February, 12:30

Suppose that 75 percent of the people in a certain metropolitan area live in the city and 25 percent in the suburbs. If 1200 people attending a certain concert represent a random sample from the metropolitan area, what is the probability that the number of people from the suburbs attending the concert will be fewer than 270?

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  1. 27 February, 16:09
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    31/40

    Step-by-step explanation:

    Probability is given by number of possible outcomes : number of total outcomes

    Number of possible outcomes = 270, number of total outcomes = 1200

    Probability (the number of people from the suburbs attending the concert is 270) = 270/1200 = 9/40

    Probability (the number of people from the suburbs attending the concert is fewer than 270) means that the number of people from the suburbs attending the concert is not 270 = 1 - 9/40 = (40-9) / 9 = 31/40
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