Instead of recording the number 1.23cm of the radius of a tube, a student recorded…

Mathematics WAEC 1989

Instead of recording the number 1.23cm of the radius of a tube, a student recorded 1.32cm. Find the percentage of error, correct to one decimal place.

  • 6.8%
  • 7.3% checkmark
  • 9.6%
  • 14.4%
  • 15.4%

The correct answer is: B

Explanation

% error =
error/exact
x
100/1



=
0.09/1.23
x
100/1
= 7.3%
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