The average score of 25 students in a test is 68. The top 5 scorers had an average of 80, and the lowest 5 had an average of 50. What is the average of the remaining 15 students?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 70.
Total marks of 25 students = 25 × 68 = 1700
Top 5 total = 5 × 80 = 400
Lowest 5 total = 5 × 50 = 250
Remaining 15 total = 1700 − 400 − 250 = 1050
Average of remaining 15 students = = 70