Discussion :: Average
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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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Answer : Option C
Explanation :
Let there be x pupils in the class.
Total increase in marks = [ x x 12] =X2
X2= (83 - 63) 
X2= 20 x= 40.
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