Aptitude - Average - Discussion
Discussion Forum : Average - General Questions (Q.No. 15)
15.
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:
Answer: Option
Explanation:
Let there be x pupils in the class.
| Total increase in marks = |  |
x x | 1 |  |
= | x |
| 2 | 2 |
 |
x | = (83 - 63)  |
x | = 20 x= 40. |
| 2 | 2 |
Discussion:
125 comments Page 13 of 13.
Sarika Jain said:
10 months ago
Thank you all.
Kavita said:
10 months ago
Thank you for explaining the answer.
(1)
Usman Khan said:
10 months ago
Good session, thanks.
Sahr smk said:
3 months ago
Difference =20.
No of pupils = 20 divided increased number.
= 20/0.5,
= 40.
No of pupils = 20 divided increased number.
= 20/0.5,
= 40.
Mohd Saif said:
4 weeks ago
Sum1 = sum of (n-1) students + 83.
Sum2 = sum of (n-1) students + 63.
avg1 = Sum1/n;
avg2 = Sum2/n.
So, avg1-avg2 = 0.5.
Or, (83-63)/n = 0.5.
Then n=40.
Sum2 = sum of (n-1) students + 63.
avg1 = Sum1/n;
avg2 = Sum2/n.
So, avg1-avg2 = 0.5.
Or, (83-63)/n = 0.5.
Then n=40.
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