waecmaths question:
The length of a piece of stick is 1.75m. A girl measured it as 1.80m. Find the percentage error.
Option A:
$\tfrac{284}{7}$%
Option B:
$\tfrac{29}{7}$%
Option C:
5%
Option D:
$\tfrac{20}{7}$%
waecmaths solution:
$\begin{align} & error=1.80m-1.75m=0.05m \\ & percentage error=\frac{error}{actual\text{ }length}\times 100percent \\ & percentageerror=\frac{0.05}{1.75}\times 100percent=\frac{5}{175}\times 100percent \\ & percentage error=\frac{20}{7}percent \\\end{align}$
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