SOLUTION: The question is : Mean of 20 observations is 17. If in the observations, observation 40 is replaced by 12, find the new mean.

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Question 857348: The question is : Mean of 20 observations is 17. If in the observations, observation 40 is replaced by 12, find the new mean.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
The question is : Mean of 20 observations is 17. If in the observations, observation 40 is replaced by 12, find the new mean.
:
Find the sum of the other 19 observations
%28%28n+%2B+40%29%29%2F20 = 17
multiply both sides by 20
n + 40 = 340
n = 340 - 40
n = 300
"observation 40 is replaced by 12,
m = %28%28300+%2B+12%29%29%2F20
m = 312/20
m = 15.6 is the new mean