7. (简答题 6.0分) Suppose that 75% of people in a certain metropolitan area live in the city and 25% of the people live in the suburbs. If 1200 people attending a certain concert represent a random sample from the metropolitan area, what is the probabilty that the number of people from the suburbs attending the conert will be fewer than 270?($(2)=0.9772 (1)=0.8413 (3)=0.9987 (333) = 0.9996

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