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
if each value of a given group of observation is multiplied by 10, the standard detion of the resulting observation is - 
Select and explain. 
A. Original std. Detion x 10, B. Original std. Detion/10, C. Original std. Detion -10, D. Original std. Detion itself
A: Original std. Detion x 10
Answer: A: Original std. Detion x 10 
Explanation: Ans. is 'a' i.e., Original standard detion X 10