A pupil's marks were wrongly entered as 83 instead of 63. Due to that the average marks for the class got increased by half (1/2). The number of pupils in the class is:

Question

Accepted Answer

Let there be x pupils in the class.

Total increase in marks =

❨

x x

1

❩

∴	x	= (83 - 63) ⟹	x	= 20 ⟹ x= 40.
	2		2

A pupil's marks were wrongly entered as 83 instead of 63. Due to that the average marks for the class got increased by half (1/2). The number of pupils in the class is:

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