推 smilestupid:QQ 我連題目都看不懂 11/02 18:15
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
想好久還是不知道怎麼算... 麻煩高手協助解題 謝謝
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