Posted by Sharon on Wednesday, July 27, 2011 at 2:40am.
If mean of 1, 2, 3,  n is 6n/11, then n is

Statistics  Dr Russ, Wednesday, July 27, 2011 at 6:41am
The sum of a series of integers (1,2,3.. n)is
n(n+1)/2
so the mean is the total/n, hence
n(n+1)/2n
=6n/11
solve for n
I got n=11

Statistics  Anonymous, Wednesday, July 27, 2011 at 11:07am
Thank you
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