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प्रश्न
The mean of a set of seven numbers is 81. If one of the numbers is discarded, the mean of the remaining numbers is 78. The value of discarded number is
विकल्प
101
100
99
98
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उत्तर
99
Explanation;
Hint:
Total of 8 numbers = 81 × 7 = 567
Total of 7 numbers = 78 × 6 = 468
The number = 567 – 468 = 99
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