I put 2.6 but I KNOW that is wrong. I do not understand this at all, will someone please fill me in??

Many thanks!!!(Hi)

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- Dec 1st 2008, 11:03 PMpleasehelpme12345The # half-way between 2.1 and 2.11
I put 2.6 but I KNOW that is wrong. I do not understand this at all, will someone please fill me in??

Many thanks!!!(Hi) - Dec 1st 2008, 11:09 PMChop Suey
$\displaystyle \frac{2.1+2.11}{2}=2.105$