# Arithmetic Mean

• November 8th 2006, 06:37 AM
Dragon
Arithmetic Mean
The arithmetic mean of nine numbers is 54. Of two number u and v are added to the list the mean of the eleven numer list becomes 66. what are the values of u and v?
• November 8th 2006, 07:01 AM
earboth
Quote:

Originally Posted by Dragon
The arithmetic mean of nine numbers is 54. Of two number u and v are added to the list the mean of the eleven numer list becomes 66. what are the values of u and v?

Hello, Dragon,

the sum of the first nine numbers is: 9 * 54 = 486.

$\frac{9*54+u+v}{11}=66$