Given that seven out of eight variables are 3, 15, 16, 18, 14, 34, and 7.
Now,
The mean of the 8 variables is 10.5
So,
A total of 8 variables is:
[tex]10.5\times8=84[/tex]Now,
Sum of the seven variables is:
[tex]3+15+16+18+14+34+7=107[/tex]Then,
[tex]\begin{gathered} 107+x=84 \\ x=84-107 \\ x=-23 \end{gathered}[/tex]
