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You wanted to add:

sum1

Which is your WORST piece of data?

It has to be that 120, doesn't it? Because that appears to be rounded to the nearest ten pounds.

So you should round your final answer to the nearest ten pounds.

120 + 1.5 + 1 + .5 = 123

ROUNDED TO THE NEAREST TEN, THAT'S 120.

 

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