he average of 20 numbers is zero. Of them, at the most, how many may be greater than zero?
Question
he average of 20 numbers is zero. Of them, at the most, how many may be greater than zero?
Solution
The average of 20 numbers is zero. This means that the sum of all 20 numbers is zero. If a number is greater than zero, there must be another number that is less than zero to balance it out and keep the average at zero. Therefore, at most, 10 numbers can be greater than zero.
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