The mean of $6$ numbers is $15$. A new number $22$ is added. The mean of the $7$ numbers is:
The mean of $6$ numbers is $15$. A new number $22$ is added. The mean of the $7$ numbers is:
- $15$
- $16$
- $17$
- $18$
Solution
Old sum $= 6\times 15 = 90$. New sum $= 90+22 = 112$. New mean $= \dfrac{112}{7} = 16$.
Asked in: IMO
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