question_answer 84)

Assume that the chances of a patient having a heard attack is 40%. It is also assumed that a meditation and yoga course reduce the risk of heard attack by 30% and prescription of certain drug reduces its chance by 25%. At a time, a patient can choose any one of the two options with equal probabilities. It is given that after going through one of the two options the patient selected at random suffers a heard attack. Find the probability that the patient followed a course of meditation and yoga? 

Answer:

Let E1 and E2 be the events of selection of meditation and yoga and or prescription of medicine respectively.       Let A = event of having a heard attack       We have P(E1) = P(E2) =       And             Required probability = P(E1/A)