Question

In expressing a length 81.472 km as nearly as possible with three significant digits, the per cent error is 

(a) 0.34% 

(b) 0.034% 

(c) 0.0034% 

(d) 0.0038%

Answer 1

(b) 0.034%

81.472 km = 81472 meters = 81500 meters with three significant digits

\(\therefore\) Error% = \(\frac{81500-81472}{81472}\) x 100 = 0.034%