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Find the lower quartile of the distribution illustrated by the cumulative frequency curve

Mathematics
WAEC 2016
Find the lower quartile of the distribution illustrated by the cumulative frequency curve
  • A. 17.5
  • B. 19.0
  • C. 27.5
  • D. 28.0
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Correct Answer: Option B
Explanation
Lower quartile,

Q1 = \(\frac{1}{4}\)Nth term

= \(\frac{1}{4}\) x 600th term

= 150th term

= 15.5 + 3 + 0.5

= 19
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