Mean of $-\dfrac{3}{5}$ and $\dfrac{1}{5}$ is

Mean of $-\dfrac{3}{5}$ and $\dfrac{1}{5}$ is
  1. $-\dfrac{1}{5}$
  2. $-\dfrac{2}{5}$
  3. $\dfrac{2}{5}$
  4. $0$

Solution

$\dfrac{1}{2}\left(-\dfrac{2}{5}\right) = -\dfrac{1}{5}$.

Asked in: IMO

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