Question 1161963
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If the mean of 10 numbers is 16, then the sum of the ten numbers is 10 times 16.  If the mean of 11 numbers is 18, the sum of the eleven numbers is 11 times 18.  The difference between the two sums is the number that was added to the original ten numbers.
								
								
John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it
<img src="http://c0rk.blogs.com/gr0undzer0/darwin-fish.jpg">
*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \  
								
{{n}\choose{r}}
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