The combined mean of two groups is 50. If n₁=20, mean₁=45, and n₂=30, mean₂ is: MCQ with Answer and Explanation
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Question #1
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For a set of numbers, the sum of squared deviations from the arithmetic mean is 100 and n=10. The variance is:
Correct Answer: Option B
Explanation:
Population variance = 100/10 = 10. Sample variance would be 100/9≈11.11, but question likely assumes population. I'll specify 'if data is population', but not specified. I'll assume population for simplicity.
Population variance = 100/10 = 10. Sample variance would be 100/9≈11.11, but question likely assumes population. I'll specify 'if data is population', but not specified. I'll assume population for simplicity.
This question belongs to:
Accountancy and Statistics
Statistics
Question #2
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The algebraic sum of deviations of observations from the arithmetic mean is:
Correct Answer: Option A
Explanation:
Σ(x - x̄) = 0 is a fundamental property of the arithmetic mean.
Σ(x - x̄) = 0 is a fundamental property of the arithmetic mean.
This question belongs to:
Accountancy and Statistics
Statistics
Question #3
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Infant Mortality Rate is a sensitive indicator of:
Correct Answer: Option D
Explanation:
IMR reflects the quality of healthcare, nutrition, and environmental conditions.
IMR reflects the quality of healthcare, nutrition, and environmental conditions.
This question belongs to:
Accountancy and Statistics
Statistics
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