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
One standard detion in normal standard curve includes value- 
Select and explain. 
A. 50%, B. 68%, C. 95%, D. 100%
B: 68%
Answer: B: 68% 
Explanation: Ans. is 'b' i.e., 68% o 1 SD includes ----> 68% of values o 2 SD includes ----> 95% of values o 3 SD includes ----> 99.7% of values