Let the mean of 6 observations and is and their variance be . Then, their mean deviation about the mean is equal to:

Explanation: Solution Humein 6 observations diye gaye hain: . Step 1: Mean ka upyog karke nikalna Humein pata hai ki Mean ( ) ka formula hai: Step 2: Variance ka upyog karke nikalna Variance ( ) ka formula hota hai: Step 3: aur ki values nikalna Equation (1) aur (2) ko solve karne par humein milta hai: Aise do numbers jinka sum aur product ho, woh hain 8 aur 10 . Isliye, observations hain: . Step 4: Mean Deviation about Mean (M.D.) Formula: Sahi Option: (3)

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