67. The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero?
A. 0 B. 1
C. 10 D. 19
Answer:
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 there sum id a, then 20th number is (-a).
