A class of 30 students recently wrote a test. If 20 students scored 80,8 students scored 90 , and 2 students scored 100, then the class average on this test was
(A) 90
(B) 84
(C) 82
(D) 86
(E) 88

Part B: Each correct answer is worth 6.
From the given information, the total amount of marks obtained by the class is $20(80)+8(90)+2(100)=2520$.

Therefore, the class average is $\frac{2520}{30}=84$.

ANsWER: (B)