On a quiz worth 5 points, two students earned a 5, zero students earned a 4, zero students earned a 3, zero students earned a 2, five students earned a 1, and four students earned a zero. find the class average on this quiz.

2(5) + 0(4) + 0(3) +0(2) + 5(1) + 4(0) = 10 + 0 + 0 + 0 + 5 + 0 = 15
Divide by # of students, which is 11, and you get the average as 15/11, or 1.3636.

Zero students means no one scored that score, the only scores that were received were "5" (2 students earned) and "1" (5 students earned) and "0" (4 students earned).