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Question 12
The mean of 22 observations is 10. Two more observations are included and the new mean becomes 11. The mean of two new observations is
Solution
Total sum of 22 observations=$$22\times10=220$$
  Total sum of 24 observations=$$24\times11=264$$
sum of 2 new observation=264-220=44
Means of 2 new observation=44/2=22
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