Question

Find the arithmetic mean
If $69.5$ is the mean of $72,70,x,62,50,71,90,64,58$ and $82$. Find the value of $x.$

Answer 1

$\begin{array}{c}y\\ 72\\ 70\\ x\\ 62\\ 50\\ 71\\ 90\\ 64\\ 58\\ 82\end{array}Arithmeticmean={\sum }_{n=1}^{n}x=\frac{72+70+x+62+50+71+90+64+58+82}{10}69.5=\frac{622+x}{10}x=73$