The mean of 10 observations is 7. The mean of 15 numbers is 12 then the mean of all observations is ( )
1) 10
2) 11
3) 12
4) 9
irrevalent answers are reported
plzzz answer......
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The mean of 10 observations is 7. The mean of 15 numbers is 12 then the mean of all observations is ( )
1) 10
2) 11
3) 12
4) 9
irrevalent answers are reported
plzzz answer......
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