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WAEC Mathematics 2011 Paper

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Question : 15

Total: 47

The length of a piece of stick is 1.75m. A girl measured it as 1.80m. Find the percentage error

$\frac{28}{7}$ %
$\frac{29}{7}$ %
5%
$\frac{20}{7}$ %

Solution:

Error = 1.80m - 1.75m = 0.05m

%error =

\frac{\text{error}}{\text{true measurement}}

x 100%

%error = $\frac{0.05}{1.75}\times 100$

%error = $\frac{20}{7}$ % or 2.86%

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