Results for a 20-point multiple choice math quiz are as follows: 9 students scored a 20,4 students scored 19, 3 students scored 18,5 students scored 17, and 1 student scored 12. What was the class's
average?

18 1/2 or 37/2

Step-by-step explanation:

To calculate the average of something, we add the numbers and divide by the count of those numbers. In this case, we have this as the sum of the numbers:

9 × 20 + 4 × 19 + 3 × 18 + 5 × 17 + 12

And the number of students as the count:

9 + 4 + 3 + 5 + 1

Now to calculate that out:

(9 × 20 + 4 × 19 + 3 × 18 + 5 × 17 + 12)/(9 + 4 + 3 + 5 + 1) ⇒

(180+76+54+85+12)/(9+4+3+5+1) ⇒

407/22 ⇒

37/2⇒

18 1/2

step-by-step explanation: