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
In a population of 200 people with normal distribution. How many people would be included in 1 SD 
Select and explain. 
A. 136, B. 140, C. 150, D. 190
A: 136
Answer: A: 136 
Explanation: Ans. a. 136