Before a major exam, you realize that the probability of you getting a perfect mark is 80% if you are on time to class, but only 55% if you are late to class. Unfortunately, you come late to class 4 out of 10 times.

What is the probability you will get perfect marks on this exam?

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Hello YOUR REQUIRED ANSWER IS 65% Let A be the event that the student comes to class on time. Let B be the event that the student gets perfect marks. Hence, given that: P(B | A) = 80%, P(B | not A) = 55%, P(A) = 40% ... See the full answer