Mean of $7$ numbers is $11$. If each number is increased by $3$, the new mean is:

Mean of $7$ numbers is $11$. If each number is increased by $3$, the new mean is:
  1. $11$
  2. $13$
  3. $14$
  4. $33$

Solution

Adding constant $c$ to every observation increases the mean by $c$. New mean $= 11+3 = 14$.

Asked in: IMO

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