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 deviation of the resulting observation is - 
Select and explain. 
A. Original std. Deviation × 10, B. Original std. Deviation/10, C. Original std. Deviation -10, D. Original std. Deviation itself
A: Original std. Deviation × 10
Answer: A: Original std. Deviation × 10 
Explanation: None