This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Biostatistics, Subject name: Social & Preventive Medicine
shape of normal distribution curve- 
Select and explain. 
A. J shape, B. U shape, C. Bell shape, D. None
C: Bell shape
Answer: C: Bell shape 
Explanation: Ref:Parks 23rd edition pg 849. Standard normal curve: It is a smooth, bell-shaped, perfectly symmetrical curve based on an infinitely large number of observations. The total area of the curve is 1 . Mean =0 Standard detion is 1 Mean, median and mode all coincide .