Question 20

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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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