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There are 7 observations in the data and...

There are 7 observations in the data and their mean is 11. If each observation is multiplied by 2, then find the new mean.

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There are 7 observation in the data.
Mean `=11`
`:. (Sigma x)/7=77`
`x_(1)+x_(2)+...+x_(7)=77`
Now, `2x_(1)+2x_(2)+...+2x_(7)`
`=2(x_(1)+x_(2)+...+x_(y))=77xx2=154`
`:.` Mean `=154/7=22`
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