A class of 25 students took an English test. 15 students had an average score of 80. The other students had an average score of 60. What is the average score of the whole class?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 72.
To find the average score of the whole class, we need to calculate the total score of all students and then divide by the total number of students.
Total score of 15 students: 15 students × 80 points/student = 1200 points
Total score of the other 10 students: 10 students × 60 points/student = 600 points
Total score of all 25 students: 1200 points + 600 points = 1800 points
Average score of the whole class: 1800 points / 25 students = 72 points/student
Therefore, the average score of the whole class is 72.