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

Mathematics
WAEC 2011

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

  • A. \(\frac{28}{7}\)%
  • B. \(\frac{29}{7}\)%
  • C. 5%
  • D. \(\frac{20}{7}\)%
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Correct Answer: Option D
Explanation

Error = 1.80m - 1.75m = 0.05m

%error = \(\frac{\text{error}}{\text{true measurement}}\) x 100%

%error = \(\frac{ 0.05}{ 1.75}\times100\)

%error = \(\frac{20}{7}\)% or 2.86%

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