Homework Answers
Let S shows the event that student attend the class when there is exam or quizz. So we have
P(S') = 0.625, P(S) = 1- P(S') = 1 - 0.625 = 0.375
Now,
P(A|S') = 0.35, P(A | S) = 0.50
So the required probability is
P(S' | A) = [P(A|S')P(S')] / [ P(A|S')P(S') + P(A|S)P(S) ] = [0.35 * 0.625] / [ 0.35 *0.625 + 0.5 * 0.375 ] = 0.5385
Answer: 0.5385
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