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F.2 MATH approximation&errors

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1. By using a srop-watch,Peter finds that the time taken for a colour printer to print 100 identical documents is 7 minutes 5 seconds, and the relative error is 1/85. What is the possible range of time required to print 1 document? please give me the steps

 

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最佳解答:

the time for a colour printer to print 100 identical documents in seconds: 7x60 +5=425s the time required to print 1 document: 425/100=4.25s max. error : 1/85 x 4.25s = 0.05s .'. the possible range of time required to print 1 document: 4.2
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