This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Normal Distribution, Skewed Distributions, Subject name: Social & Preventive Medicine
If the bih weight of each of the 10 babies born in a hospital in a day is found to be 2.8 kg, then the Standard detion of this sample will be:- 
Select and explain. 
A. 2.8, B. 0, C. 1, D. 0.28
B: 0
Answer: B: 0 
Explanation: - Standard detion is detion of each value from the standard value. - In the given question, the bih weight of each of the 10 babies born in a hospital in a day is found to be 2.8 kg, - standard detion of this sample, SD (s)=