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 6 of 14.
Sai said:
7 years ago
@All.
Why we think only one no is negative, let we think maybe 10 numbers -ve; i.e 10 numbers less than zero and 10 numbers is +ve i.e 10 numbers greater than zero. so the avg of -10 numbers and +10 numbers is equal to zero.
Why we think only one no is negative, let we think maybe 10 numbers -ve; i.e 10 numbers less than zero and 10 numbers is +ve i.e 10 numbers greater than zero. so the avg of -10 numbers and +10 numbers is equal to zero.
Vignesh said:
7 years ago
1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1-19 = 0.
Therefore 0/20 =0.
Therefore 0/20 =0.
Poonam said:
7 years ago
Thanks @Ravi.
Vignesh said:
8 years ago
For example : The Sum of first 19 number is 20 and the last number is -20. Therefore 20 -20 = 0.
Sugi s said:
8 years ago
Thanks for your answer @Ravi.
Ravi said:
8 years ago
Listen, guys.
Question is at most numbers are greater than zero. At most mean maximum.
So let's do.
Av of 20 no are zero.
Lets count.
0+1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19/20=0. Ok.
Count how many no are greater than zero? 19 then answer is 19.
Question is at most numbers are greater than zero. At most mean maximum.
So let's do.
Av of 20 no are zero.
Lets count.
0+1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19/20=0. Ok.
Count how many no are greater than zero? 19 then answer is 19.
(1)
Aman said:
8 years ago
Thanks @Harika.
(1)
Divya said:
8 years ago
Can't understand friends
Kotana narendra Kumar said:
8 years ago
In question, they mentioned atmost Which Means a maximum number of possibilities.
So 19 is the right one.
So 19 is the right one.
Seeramsetty kavya said:
8 years ago
Why can't there be less than 19 positive numbers?
For example : 1+2+3+0+4+5--------19.
For example : 1+2+3+0+4+5--------19.
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