In answering a question on a multiple choice test, a student either knows the answer or guesses. Let 3/4 be the probability that he knows the answer and 1/4 be the probability that he guesses. Assuming that a student who guesses at the answer will be correct with probability 1/4 . What is the probability that the student knows the answer given that he answered it correctly?

Asked by Topperlearning User | 4th Jun, 2014, 01:23: PM

Expert Answer:

Let E1 be the event that the student knows the answer, E2 be the event that the student guesses the answer and A be the event that answer is correct.

Answered by  | 4th Jun, 2014, 03:23: PM