Answer:
x=12
Step-by-step explanation:
(1+3+6+8+x)/5=6
1+3+6+8+x=30
18+x=30
12.
There are 5 numbers so the sum, if the mean is 6, is 30.
1 + 3 + 6 + 8 + x = 30
18 + x = 30
x = 30 - 18 = 12.