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
Out of 11 bihs in a hospital, 5 babies weighed over 2.5 kg and 5 weighed less than 2.5 kg. What value does 2.5 represent: 
Select and explain. 
A. Geometric average, B. Arithmetic average, C. Median average, D. Mode
C: Median average
Answer: C: Median average 
Explanation: The 'median' refers to the value of the middle observation, when data is arranged in an ascending or descending order of magnitude. In the given question, 5 values are greater then '2.5' and 5 values are less than '2.5'. Thus, 2.5 is the middle value of this set of data and stands for the median. Ref: Park's Textbook of Preventive and Social Medicine By K. Park, 19th Edition, Pages 699, 700.