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OpenStudy (anonymous):
The average number of 7 numbers is 38. When an eighth number is added, the average increases by1. Find the eighth number
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OpenStudy (anonymous):
so the sum of these 7 number is 7*38=266 the eighth number will increase average by 1 so the new sum is 8*39=312 so the eighth no is 312-266=46
OpenStudy (anonymous):
Many thanks
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