The geometric mean of 1, 3, 9 is: MCQ with Answer and Explanation

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The geometric mean of 1, 3, 9 is:

A. 3.3

B. 13

C. 4.33

D. 3

Answer: Option D

Solution (By JKSSB Mock Tests)

(1×3×9)^(1/3) = 27^(1/3) = 3.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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Gross Reproduction Rate (GRR) differs from TFR by:

A. Expressing rate per 100 women instead of 1,000

B. Including only female births in the numerator

C. Adjusting for infant mortality

D. Using a different age range for women

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Correct Answer: Option B

Explanation:
GRR = Σ (ASFR for female births only) × 5 (for 5-year age groups), measuring the average number of daughters a woman would have, focusing on female offspring for generational replacement analysis.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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In probability, an event that contains all possible outcomes is called:

A. Sure event

B. Impossible event

C. Simple event

D. Null event

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Correct Answer: Option A

Explanation:
Sure event equals the sample space, P = 1.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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If the events A and B are independent, P(A)=0.4, P(B)=0.5, then P(A'∩B') is:

A. 0.2

B. 0.9

C. 0.3

D. 0.5

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Correct Answer: Option C

Explanation:
P(A')=0.6, P(B')=0.5, independence gives 0.6×0.5=0.3.

This question belongs to: Accountancy and Statistics Statistics

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