Karan's marks were incorrectly entered as 83 instead of 63. Due to that the average marks for the class got increased by $\frac{1}{2}$ . The number of pupils in the class is:

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Solution

The correct option is B
40

By increasing 20 marks, the average of the class increases by $\frac{1}{2}$ . Thus, the number of pupils in the class is 40.

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Karan's marks were incorrectly entered as 83 instead of 63. Due to that the average marks for the class got increased by 12. The number of pupils in the class is:

The correct option is B 40 By increasing 20 marks, the average of the class increases by 12. Thus, the number of pupils in the class is 40.

Karan's marks were incorrectly entered as 83 instead of 63. Due to that the average marks for the class got increased by $\frac{1}{2}$ . The number of pupils in the class is:

The correct option is B
40

By increasing 20 marks, the average of the class increases by $\frac{1}{2}$ . Thus, the number of pupils in the class is 40.