Answer:
90
Step-by-step explanation:
Create an equation where all the numbers are added together and divided by 6 to equal 80:
[tex]\frac{72+86+92+63+77+x}{6} = 80[/tex]
Simplify and solve for x:
[tex]\frac{390 + x}{6} = 80[/tex]
[tex]390 + x = 480[/tex]
[tex]x = 90[/tex]
