Weighted mean of values 10, 20, 30 with weights 3, 2, 1 respectively is: MCQ with Answer and Explanation
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Question #1
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Which property of the arithmetic mean states that the sum of deviations from the mean is always zero?
Correct Answer: Option C
Explanation:
The sum of deviations of all observations from their arithmetic mean is always zero, i.e., Σ(x - x̄) = 0, which is a fundamental algebraic property of the mean.
The sum of deviations of all observations from their arithmetic mean is always zero, i.e., Σ(x - x̄) = 0, which is a fundamental algebraic property of the mean.
This question belongs to:
Accountancy and Statistics
Statistics
Question #2
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Vital statistics are crucial for calculating which of the following indicators?
Correct Answer: Option D
Explanation:
IMR directly uses vital statistics data on live births and infant deaths; other options rely on broader datasets (e.g., GDP on economic surveys, HDI on multiple sources, literacy on census/surveys).
IMR directly uses vital statistics data on live births and infant deaths; other options rely on broader datasets (e.g., GDP on economic surveys, HDI on multiple sources, literacy on census/surveys).
This question belongs to:
Accountancy and Statistics
Statistics
Question #3
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From a standard deck of 52 cards, one card is drawn. What is the probability that it is either a King or a Heart?
Correct Answer: Option C
Explanation:
P(K or Heart) = P(K) + P(Heart) - P(King of Hearts) = 4/52 + 13/52 - 1/52 = 16/52.
P(K or Heart) = P(K) + P(Heart) - P(King of Hearts) = 4/52 + 13/52 - 1/52 = 16/52.
This question belongs to:
Accountancy and Statistics
Statistics
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