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Unit 5 · Mathematical Reasoning and Aptitude Paper 1 · 26 June 2025 Morning

Standard deviation (S) and coefficient of variation (CV, expressed as a percentage) of different datasets are given in A-D, below. Compute the mean of each dataset and arrange in ascending order.
A. S = 4, CV = 40/9
B. S = 5, CV = 6.25
C. S = 14, CV = 70/3
D. S = 16, CV = 160/7
Choose the correct answer from the options given below:
विभिन्न आँकड़ा-समूहों के मानक विचलन (S) तथा विचरण गुणांक (CV, प्रतिशत में) नीचे A-D में दिए गए हैं। प्रत्येक आँकड़ा-समूह का माध्य ज्ञात कीजिए और उन्हें आरोही क्रम में व्यवस्थित कीजिए।
A. S = 4, CV = 40/9
B. S = 5, CV = 6.25
C. S = 14, CV = 70/3
D. S = 16, CV = 160/7
नीचे दिए गए विकल्पों में से सही उत्तर चुनिए:

Pick an option to check yourself, or open the answer below.

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Correct answer: B. C, D, B, A

Explanation

CV = (S/Mean) × 100, so Mean = S × 100 / CV. A: 4 × 100 ÷ (40/9) = 90. B: 5 × 100 ÷ 6.25 = 80. C: 14 × 100 ÷ (70/3) = 60. D: 16 × 100 ÷ (160/7) = 70. Ascending order of means (60, 70, 80, 90) gives C, D, B, A.CV = (S/माध्य) × 100, अतः माध्य = S × 100 / CV। A: 4 × 100 ÷ (40/9) = 90। B: 5 × 100 ÷ 6.25 = 80। C: 14 × 100 ÷ (70/3) = 60। D: 16 × 100 ÷ (160/7) = 70। माध्यों का आरोही क्रम (60, 70, 80, 90) देता है C, D, B, A।

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