Aptitude - Average - Discussion
Discussion Forum : Average - General Questions (Q.No. 4)
4.
The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero?
Answer: Option
Explanation:
Average of 20 numbers = 0.
Sum of 20 numbers (0 x 20) = 0.
It is quite possible that 19 of these numbers may be positive and if their sum is a then 20th number is (-a).
Discussion:
135 comments Page 7 of 14.
Praneeth said:
8 years ago
Let assume 10 numbers above 0 (2,3,4,5,6,7,8,9,10).
The remaining 10 numbers are - ve (-2,-3,-4,-5,-6,-7,-9,-10).
Why can 10 be the answer?
The remaining 10 numbers are - ve (-2,-3,-4,-5,-6,-7,-9,-10).
Why can 10 be the answer?
Srj said:
8 years ago
Thanks @Tarun.
Amar said:
8 years ago
10 + and 10 - nos gives answer 10 but the correct answer is 19 because he asked most of nos.
Dinesh said:
8 years ago
I can't understand this problem. Please anyone help me.
Arpita Saxena said:
8 years ago
But can it also be like;
All numbers are 0.
Therefore sum =0,
And sum/20 = avg.
Therefore 0/20 = 0.
Hence 0 be the answer.
All numbers are 0.
Therefore sum =0,
And sum/20 = avg.
Therefore 0/20 = 0.
Hence 0 be the answer.
Trishul said:
8 years ago
Very good explanation. Thank you all.
Pingal rami said:
8 years ago
Your explanation is good, Thanks @Prabhat Kr.Singh.
Nobi said:
9 years ago
@Amin Ullah.
Since when 20/20 = 0.
Since when 20/20 = 0.
Pooja said:
9 years ago
Your explanation is good @Tarun.
Amin Ullah said:
9 years ago
While the actual answer is 20.
Suppose all 20 numbers are of value =1 then,
1+1+1....till 20. Thier sum will be 20.
Avg=sum of all number/total number.
Avg= 20/20.
= 0.
So, as for question is concern there is no option with 20. The nearest 19 will do.
Suppose all 20 numbers are of value =1 then,
1+1+1....till 20. Thier sum will be 20.
Avg=sum of all number/total number.
Avg= 20/20.
= 0.
So, as for question is concern there is no option with 20. The nearest 19 will do.
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