Question

Mean of $9,11,13,P,18,19$ is $P$. Find the value of $P$.

Answer 1

Given:

$\frac{9+11+13+P+18+19}{6}=P$

$\Rightarrow \frac{70+P}{6}=P\Rightarrow 5P=70$

$\Rightarrow P=14$