If we have five numbers :X,Y,Z,L,k,the arithmetic mean between X,Y,Z is equal to 8,and the arithmetic mean between X,Y,Z,L,K is equal to 7,what is the arithmetic mean between L,K?
Follow Math Help Forum on Facebook and Google+
$\displaystyle \frac{X+Y+Z}{3}=8$ $\displaystyle \frac{X+Y+X+L+K}{5}=7$
So the answer is 5,5?
I would write 5.5 but yes, 5,5 in France and elsewhere I believe..
View Tag Cloud