Engineering Lab: Error Calculations - Help Needed!

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Hello yall I am new here. I am a first year student in engineering.
I'm writing up a lab now and I am supposed to be showing the error. the error usually accurs when adding subtracting muliplying of dividing variables. Only I am a little clueless here.
please help.
 
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The error you should be concerned with is the error involved in measuring. Once you know that you should be able to arrange for carrying enough decimal places that "round off error", which is the only kind of error that can occur in mathematical clalculations, is negligable.
 
Thanks that makes sense. I've been getting writers block from working nonstop.
 

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