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NECO Mathematics 2007 Objective — Question 15

Question 15 of 60 from the National Examinations Council (NECO) Mathematics 2007 Objective paper, with the correct answer and a full explanation.

The length of a classroom window was measured as 400cm. Find the percentage error if the actual length is 399.5cm.

A. 0.125%Correct
B. 0.135%
C. 0.215%

Explanation

Error = 400-399.5 = 0.5cm. %error = (0.5/399.5)x100% = 0.125%.

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