A company is interviewing potential employees. Suppose that each candidate is either qualified, or unqualified with given probabilities "Q" and "1-Q", respectively. The company tries to determine a candidate's qualifications by asking 20 true-false questions. A qualified canddate has a probability "P" of answering a question correctly, while an unqualified candidate has a probability "P"of answering incorrectly. The answers to different questions are assumed to be independent. If the company considers anyone with at least 15correct answers qualified, and everyone else unqualified, give a formula for the probability that the 20 questions will correctly identify someone to be qualified or unqualified. 朋友问我的题目!我想算出的东西很长一串= =" 麻烦各位看看能不能解出来!谢谢 --

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