Which of the following pairs are mutually exclusive? MCQ with Answer and Explanation
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Question #1
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The arithmetic mean of first n natural numbers is:
Correct Answer: Option C
Explanation:
Sum = n(n+1)/2, mean = (n+1)/2.
Sum = n(n+1)/2, mean = (n+1)/2.
This question belongs to:
Accountancy and Statistics
Statistics
Question #2
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Which of the following is a quantitative classification?
Correct Answer: Option D
Explanation:
Height is a measurable quantity, hence quantitative classification.
Height is a measurable quantity, hence quantitative classification.
This question belongs to:
Accountancy and Statistics
Statistics
Question #3
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If the arithmetic mean of 5 numbers is 20, and the arithmetic mean of another 3 numbers is 28, the combined mean of all 8 numbers is:
Correct Answer: Option B
Explanation:
Combined mean = (5×20 + 3×28) / (5+3) = (100 + 84) / 8 = 184 / 8 = 23. This formula weights each group's mean by its size.
Combined mean = (5×20 + 3×28) / (5+3) = (100 + 84) / 8 = 184 / 8 = 23. This formula weights each group's mean by its size.
This question belongs to:
Accountancy and Statistics
Statistics
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