If the mean of $10$ observations is $25$, the sum of all observations is:

If the mean of $10$ observations is $25$, the sum of all observations is:
  1. $100$
  2. $200$
  3. $250$
  4. $25$

Solution

Sum $=$ Mean $\times$ number of observations $= 25 \times 10 = 250$.

Asked in: IMO

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