Multiple choice

The average mark of a student in 4 subjects is 75. If the student obtained 80 marks in the 5th subject, then the new average is

  1. $77.5$
  2. $77$
  3. $76$
  4. $72.5$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Total marks in 4 subjects = 4 × 75 = 300. With 80 marks in 5th subject, new total = 300 + 80 = 380. New average = 380/5 = 76. The average increases because the new score (80) is above the old average (75), pulling the average up. Options A, B, and D result from calculation errors like adding incorrectly or dividing by wrong number of subjects.

Keep practicing — related questions