Harmonic mean is undefined if: MCQ with Answer and Explanation
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Question #1
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In demography, 'cohort' refers to:
Correct Answer: Option B
Explanation:
A cohort is a group sharing a common temporal experience, like birth year.
A cohort is a group sharing a common temporal experience, like birth year.
This question belongs to:
Accountancy and Statistics
Statistics
Question #2
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If the mean of a set of 10 observations is 20, and 5 is added to each observation, what will be the new mean?
Correct Answer: Option D
Explanation:
The arithmetic mean is affected by the change of origin. If a constant is added to all observations, the mean increases by that constant.
The arithmetic mean is affected by the change of origin. If a constant is added to all observations, the mean increases by that constant.
This question belongs to:
Accountancy and Statistics
Statistics
Question #3
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The probability of obtaining a sum of 9 in a single throw of two dice is:
Correct Answer: Option C
Explanation:
Favorable outcomes: (3,6),(4,5),(5,4),(6,3) → 4. Probability = 4/36 = 1/9.
Favorable outcomes: (3,6),(4,5),(5,4),(6,3) → 4. Probability = 4/36 = 1/9.
This question belongs to:
Accountancy and Statistics
Statistics
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