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WAEC Mathematics 1997 Question 5

Question 5

Ratio, Percentages and Rates

A student found the approximate value of 0.02548 correct to two places of decimal instead of two significant figures. Find the percentage error.

  1. A.0%
  2. B.13 1/3%
  3. C.15 5/13%
  4. D.16 2/3%
  5. E.20%
Show the answer and explanation

Answer: E (20%)

Explanation

To 2 d.p. the student got 0.03; the correct 2 s.f. value is 0.025. Error = 0.005, and 0.005/0.025 × 100% = 20%.