If the mean deviation of a set of observations is 15, then the value of quartile deviation is:  

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SSC CGL Tier-II (JSO) 2022 Official Paper (Held On: 4 March 2023)
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  1. 13.5
  2. 10.5
  3. 12.5
  4. 11.5

Answer (Detailed Solution Below)

Option 3 : 12.5
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SSC CGL Tier 1 2025 Full Test - 01
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Detailed Solution

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The correct answer is 12.5
Key Points Given,
The mean deviation of a set of observations (MD) is 15. 
MD =  , where  is the standard deviation 
Or,  ______ (1)
The value of quartile deviation (QD) =  ________ (2)
Combining (1) and (2), QD , as MD = 15 
Or, QD = 12.5 

Hence, the value of the quartile deviation is 12.5. 
 

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