The arithmetic mean of 5 numbers is 20. If one number is excluded, the mean of the remaining 4 numbers becomes 18. The excluded number is: MCQ with Answer and Explanation
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Question #1
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Which of the following is an example of primary data?
Correct Answer: Option A
Explanation:
Primary data is original data collected firsthand for a specific purpose; a survey questionnaire is a primary source. The other options are secondary data.
Primary data is original data collected firsthand for a specific purpose; a survey questionnaire is a primary source. The other options are secondary data.
This question belongs to:
Accountancy and Statistics
Statistics
Question #2
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A random variable X has expected value E(X) = 5 and E(X²) = 29. The variance is:
Correct Answer: Option A
Explanation:
Var(X) = E(X²) - [E(X)]² = 29 - 25 = 4.
Var(X) = E(X²) - [E(X)]² = 29 - 25 = 4.
This question belongs to:
Accountancy and Statistics
Statistics
Question #3
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If Net Reproduction Rate (NRR) is less than 1, the population will eventually:
Correct Answer: Option A
Explanation:
NRR < 1 indicates each generation is not replacing itself, leading to decline.
NRR < 1 indicates each generation is not replacing itself, leading to decline.
This question belongs to:
Accountancy and Statistics
Statistics
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