Explanation : Data given in the question: P(CFA) = 70%, P(CTP) = 60%
P(CTP | CFA) = P(CTP CFA) / P(CFA)
We have to find the passing rate of CTP giving members who have
passed the CFA exams as well.
P(CFA and CTP) = P (CTP CFA) = P (CFA | CTP) * P(CTP) = 0.5 * 0.6 = 0.3
P(CTP | CFA) = P(CTP and CFA) / P(CFA) = 0.3 / 0.7 = 0.428 or 42.8%