This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
What is the probability that confounding factor fall to the right of 95% ? 
Select and explain. 
A. 1 in 5, B. 1 in 10, C. 1 in 20, D. 1 in 40
D: 1 in 40
Answer: D: 1 in 40 
Explanation: Ans. is 'd' i.e., l in 40 Similar to above question i) values out side the 95% (2SD) --> 4 5% (1 in 20). ii) values above (right to) the 95% (2SD) --> 2.5% (1 in 40) iii) values below (left to) the 95% (2SD) --> 2.5% (1 in 40)