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NDA 2025 Maths · Mathematics · Statistics · medium

For the data 10,25,40,55,90, the coefficient of range is

Single correct option

For the data 10,25,40,55,9010,25,40,55,90, the coefficient of range is
  1. A. 0.40.4
  2. B. 8080
  3. C. 0.80.8
  4. D. 1.251.25
Show answer and solution

Answer: (C) 0.80.8

Range =90−10=80=90-10=80 and the coefficient of range is L−SL+S=80100=0.8\frac{L-S}{L+S}=\frac{80}{100}=0.8. The value 8080 is the range itself (not a coefficient), 0.40.4 divides by 200200, and 1.251.25 inverts the ratio. The coefficient is a pure number, useful to compare dispersions.
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Original question written in the NDA 2025 Maths pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake