Multiple choice

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

  1. 80

  2. 76

  3. 92

  4. 95

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Initial sum = 4 * 75 = 300. New sum = 300 + 80 = 380. New average = 380 / 5 = 76.

AI explanation

The total marks for the first four subjects is the average multiplied by the number of subjects, which is 75 multiplied by 4, giving 300. Adding the marks of the fifth subject gives a new total of 300 plus 80, which is 380. Dividing this new total by 5 gives the new average of 76.

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