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In their solution, they have sqrt(3)*0.5 and sqrt(4)*0.5. I get the 3 and 4 are the n values, where does the 0.5 come from? If you look at #5 right above it, the uncertainty is used. In #6, the uncertainty is 0.05 and 0.10, not 0.5. After that I got it just fine- thanks!

 
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