We have to sum the numbers together here.
[tex]\begin{gathered} \frac{104+137+154+131+Z}{5}\text{ = }\frac{130}{1} \\ \frac{526+Z}{5}\text{ = }\frac{130}{1} \\ 526\text{ +Z = 5 X 130} \\ 526\text{ + Z = 650} \\ Z\text{ = 650 -526} \\ Z\text{ = 124} \end{gathered}[/tex]Answer is 124
