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Question
The mean of 20 numbers is zero. Of them, at the most, how many may be greater than zero?
Options
0
1
10
19
MCQ
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Solution
19
Explanation:
Mean of 20 numbers = 0.
∴ Sum of 20 numbers = 0 × 20 = 0.
It is possible that 19 of these numbers may be positive and if their sum is a, the 20th number is (–a).
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