Question 543112
   First of all add the total of all the points and divide it by the number of 

students in the class.

  98 + 98 + 87 +87 +87 +87 + 87 +81 +75 +75 +75+75 +75 +75 (points)  /  14 students(total number of students in class)


   1087 / 14

The average score of the class = 77.6