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JAMB Mathematics 2010 Paper

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Question : 23

Total: 49

A student measures a piece of rope and found that it was 1.26m long. If the actual length of the rope was 1.25m, what was the percentage error in the measurement?

0.25%
0.01%
0.80%
0.40%

Solution:

Actual length of rope = 1.25m

Measured length of rope = 1.26m

error = (1.26 - 1.25)m - 0.01m

Percentage error =

\frac{error}{\text{actual length}}

x 100%

=

\frac{0.01}{1.25}

x 100%

= 0.8%

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