PLEASE HELP!!! URGENT! I'm completely stuck on this problem, could someone please explain why the answer to this is: (1/20)

"Gia's ruler is divided into tenths of an inch. What fraction of an inch represents the greatest possible measurement error due to Gia's ruler? Why?"

Thanks!

Question

PLEASE HELP!!! URGENT!  I'm completely stuck on this problem, could someone please explain why the answer to this is:  (1/20)   

"Gia's ruler is divided into tenths of an inch.  What fraction of an inch represents the greatest possible measurement error due to Gia's ruler?  Why?"

Thanks!

unklerhaukus · Answer

ok so 1/20 is 2 tenths of an inch right/?
When making a measurement you can really only be certain that the value to be measured is between some divisions on the ruler, one on either side
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The error in certainty of the  measurement will be at least 2 divisions on the rule or scale