Mean (M) and coefficient of variation (CV expressed as a percentage) of different datasets are given in A-D below. Compute the standard deviation of each dataset and arrange in ascending order.
A. M = 60, CV = 70/3
B. M = 80, CV = 6.25
C. M = 70, CV = 160/7
D. M = 90, CV = 40/9
Choose the correct answer from the options given below:भिन्न-भिन्न आँकड़ा समुच्चयों के माध्य (M) और विचरण गुणांक (CV, प्रतिशत में व्यक्त) नीचे A-D में दिए गए हैं। प्रत्येक आँकड़ा समुच्चय का मानक विचलन ज्ञात कीजिए और आरोही क्रम में व्यवस्थित कीजिए।
A. M = 60, CV = 70/3
B. M = 80, CV = 6.25
C. M = 70, CV = 160/7
D. M = 90, CV = 40/9
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Correct answer: C. D, B, A, C
Explanation
CV = (SD ÷ Mean) × 100, so SD = Mean × CV ÷ 100. A: 60 × (70/3)/100 = 14. B: 80 × 6.25/100 = 5. C: 70 × (160/7)/100 = 16. D: 90 × (40/9)/100 = 4. Ascending order of SD (4, 5, 14, 16) is D, B, A, C.CV = (मानक विचलन ÷ माध्य) × 100, अतः मानक विचलन = माध्य × CV ÷ 100। A: 60 × (70/3)/100 = 14। B: 80 × 6.25/100 = 5। C: 70 × (160/7)/100 = 16। D: 90 × (40/9)/100 = 4। मानक विचलन का आरोही क्रम (4, 5, 14, 16) = D, B, A, C।More Research Aptitude questions
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