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Question
Ave of 10 numbers is 12. On excluding the 10th no, the ave becomes 11. Find the 10th no.
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Answer
Sum of data= average x no of data
including 10th no- 12 x 10=120
excluding 10th no- 11 x 9=99
10th no=120-99
=21
ANS: 10th no= 21
