Answer:
X=10
Step-by-step explanation:
x=10
3.15+6.85 is 10 so x is 10
7.3
The mean of 4.6, 3, 8.1, 9, 12, 3, 9, 3.5, 7, 3. 6, 22 , 5.8 , 9 , 3 is 7.3