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WAEC Mathematics 1996 Question 48

Question 48

Measures of Dispersion

What percentage of observation lie outside interquartile range of any distribution?

  1. A.12½%
  2. B.25%
  3. C.50%
  4. D.62½%
  5. E.75%
Show the answer and explanation

Answer: C (50%)

Explanation

The interquartile range runs from the lower quartile (25%) to the upper quartile (75%), holding the middle 50%. The other 50% lies outside it.