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WAEC Mathematics 2023 Paper

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Question : 46

Total: 50

A notebook of length 15 cm was measured to be 16.8 cm, calculate, correct to two d.p, the percentage error in the measurement.

12.00%
11.71%
10.71%
11.21%

Solution:

Concept:

Percentage error compares the error in a measurement to the actual value, expressed as a percentage.

Explanation:

Measured length

= 16.8

cm

Actual length

= 15

cm

Error

= 16.8 - 15 = 1.8

cm

Use the formula:

\text{Percentage error} = \frac{\text{Error}}{\text{Actual value}} \times 100\%

So,

\text{Percentage error} = \frac{1.8}{15} \times 100\%

= 0.12 \times 100\%

= 12.00\%

Answer:

12.00\%

(Option A)

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