The average of 6 number is 9 , when one number is discarded the average of the remaining numbers becomes 7.2. What is the discarded number?

7.8

12.4

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উত্তর: 18

Total of 6 number is 6×9 = 54 If 1 number is discarded then there are 5 numbers So, total of 5 number is 5×7.2 = 36 So the discarded number is = ( 54 - 36) = 18

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