the average of 10 observations is 21 a new observation is included and | Examsbook

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Q:
The average of 10 observations is 21. A new observation is included and the average of these 11 numbers is 1 less than the prevoius average. The 11^th observation is____

1
11
2
10
3
21
4
12

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Answer : 2. "10"

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