In expressing a length

Question

In expressing a length 810472 km as nearly as possible with three significant digits , find the percentage error.

Options:

A . 0.035%

B . 0.033%

C . 0.034%

D . 0.036%

Answer: Option C

Error = (81.5 - 81.472)km = 0.028.
Required percentage = [(0.028/81.472)*100]% = 0.034%.

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