This histogram shows the numbers of students who received each score on a 20 - point quiz. What was the mean quiz score? Express your answer as a decimal to the nearest tenth.
Avg = sum of weighted scores / number of students
[ 8(1) + 11(1) + 12(2) + 14(4) + 15(6) + 16(7) + 17(2) + 18(3) + 20(4) ]
____________________________________________________________ =
[ 1 + 1 + 2 + 4 + 6 + 7 + 2 + 3 + 4]
469
_____ ≈ 15.6
30
