Question
Engineering Mathematics Question on Sampling Theorems
In a sample of 100 heart patients, each patient has 80% chance of having a heart attack without medicine X. It is clinically known that medicine X reduces the probability of having a heart attack by 50%. Medicine X is taken by 50 of these 100 patients. The probability that a randomly selected patient, out of the 100 patients, takes medicine X and has a heart attack is
A
40%
B
60%
C
20%
D
30%
Answer
20%
Explanation
Solution
The correct option is (C) : 20%.