he average of 30 numbers is zero. Of them, at the most, how many may be greater than zero?  Select
A) 29
B) 1
C) 10
D) 30
E) 8

Rationale: average of 30 numbers = 0 . sum of 30 numbers ( 0 x 30 ) = 0 . it is quite possible that 29 of these numbers may be positive and if their sum is a the 30 th number is ( - a ) . answer : option a
Answer: A