This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Measures of Central Tendency and Distribution, Subject name: Social & Preventive Medicine
Systolic BP of a group of person follows normal distribution curve. The mean BP is 120. The values above 120 are: 
Select and explain. 
A. 25%, B. 75%, C. 50%, D. 100%
C: 50%
Answer: C: 50% 
Explanation: Ans. is 'c' i.e. 50% in the normal distribution curve 50% of values lies on either side of the mean .Therefore values lying above 120 (which is the mean B.R) are 50%