Posted by
Sharon on
.
If mean of 1, 2, 3,  n is 6n/11, then n is

Statistics 
Dr Russ,
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,
Thank you