The table shows the scores of a group of students in a test. If the average score is 3.5, find the value of x

A.
1 
B.
2 
C.
3 
D.
4 
E.
5
Correct Answer: Option B
Explanation
1 + 8 + 15 + 24 + 12 + x18 + x
= 3.5
120 + 10x = 126 + 7x
3x = 6
x = 2