Which of the following is a secondary source of data? MCQ with Answer and Explanation
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Question #1
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The harmonic mean of the numbers 3, 6, 9 is:
Correct Answer: Option D
Explanation:
HM = 3 / (1/3 + 1/6 + 1/9) = 3 / ( (6+3+2)/18 ) = 3 / (11/18) = 54/11 ≈ 4.909.
HM = 3 / (1/3 + 1/6 + 1/9) = 3 / ( (6+3+2)/18 ) = 3 / (11/18) = 54/11 ≈ 4.909.
This question belongs to:
Accountancy and Statistics
Statistics
Question #2
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According to Sturges' rule, the approximate number of classes for n = 50 is: (Use k = 1 + 3.322 log₁₀ n)
Correct Answer: Option B
Explanation:
log₁₀50 ≈ 1.699; 3.322 × 1.699 ≈ 5.64; 1 + 5.64 = 6.64, which rounds to 7 classes.
log₁₀50 ≈ 1.699; 3.322 × 1.699 ≈ 5.64; 1 + 5.64 = 6.64, which rounds to 7 classes.
This question belongs to:
Accountancy and Statistics
Statistics
Question #3
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If the Arithmetic Mean (AM) of two positive numbers is 10 and their Geometric Mean (GM) is 8, what is their Harmonic Mean (HM)?
Correct Answer: Option C
Explanation:
For two positive numbers, AM × HM = GM². Therefore, 10 × HM = 64, which gives HM = 6.4.
For two positive numbers, AM × HM = GM². Therefore, 10 × HM = 64, which gives HM = 6.4.
This question belongs to:
Accountancy and Statistics
Statistics
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