推 hchs31705:呃 是P(對|不知)還是P(不知|對) @@ 10/27 17:19
推 hchs31705:P(對|不知)=P(對且不知)/P(不知)=(1-q)[(1/2)^5]/(1-q) 10/27 17:22
Suppose that the probability of a student knows the correct answer
of question #2 is q. What is the conditional probability that a
student does not know the answer to question #2 given that he
answers it correctly? Assume that student will randomly choose
answers if he or she does not know the correct answer.
(#2為五個選項的複選題)
我的問題是
解答寫P(對|不知)=1/32，但我不知道這個機率是怎麼算出來的...
請高手指教
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 118.169.167.215