Question

mean of 10 observations is 15. If one observation 6 is deleted from the data. Find the correct mean​

Answer 1

See

Mean of 10 nos =15

Then sum of those 10 No's would be , 15*10=150

Now if 6 is one of those 10 No's. then after removing 6, the sum would be 150-6= 144

Now instead of 10 there will be 9 No's. So mean would be 144/9= 16

Answer 2

Sum of 10 obs/10=15= mean;
If six is removed;
Sum of 9obs/9=?;
=>150-6/9=144/9=16.

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