Multiple choice

A student's marks were wrongly entered as 93 instead of 73. Due to this error the average marks of the entire class got increased by one fourth. Find the number of students in the class.

  1. 20

  2. 40

  3. 80

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
AI explanation

The incorrect entry increases the overall class sum by 93 minus 73 = 20 marks. This 20 mark increase raises the class average by one fourth, meaning the class has 20 divided by 0.25 = 80 students. The result is 80.

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