The mean of first $5$ natural numbers is:

The mean of first $5$ natural numbers is:
  1. $2$
  2. $3$
  3. $2.5$
  4. $5$

Solution

First $5$ natural numbers: $1,2,3,4,5$. Mean $= \dfrac{1+2+3+4+5}{5} = \dfrac{15}{5} = 3$.

Asked in: IMO

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