The admission office of a small college is asked to accept deposits from a number of qualified prospective freshmen so that, with probability about 0.95, the size of the freshman class will be less than or equal to 120. Suppose the applicants constitute a random sample from a population of applicants, 80% of whom would actually enter the freshman class if accepted. A. How many deposits should the admissions conselor accept? B. If applicants in the number determined in part A are accepted, what's the probability that the freshman size will be less than 105? ans: A. 141. B. 0.0401 想好久还是不知道怎麽算... 麻烦高手协助解题 谢谢 --

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