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Recent questions tagged averages

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Averages
The average of $20$ numbers is zero.Of them, at the most, how many may be greater than zero? $10$ $19$ $17$ $9$
The average of $20$ numbers is zero.Of them, at the most, how many may be greater than zero?$10$$19$$17$$9$
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arun sharma
answer is A please explain
answer is A please explain
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