Question on: JAMB Mathematics - 2017
If a rod 10cm in length was measured as 10.5cm, calculate the percentage error
A
5%
B
10%
C
8%
D
7%
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Correct Option: A
Actual measurement = 10cm
approximated value of measurement = 10.5cm
% error = (\frac{\text{Actual measurement − Approximated}}{\text{Actual measure}}) × 100
= (\frac{10 − 10.5}{10}) × 100
= (\frac{-0.5}{10}) × 100
ignore -sign i.e take absolute value
= (\frac{0.5}{10}) × 100
= 5 %
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