The geometric mean of a set of 5 positive observations is 6. Four of them are 3, 6, 4, and 9. The fifth observation is: MCQ with Answer and Explanation

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The geometric mean of a set of 5 positive observations is 6. Four of them are 3, 6, 4, and 9. The fifth observation is:

A. 18

B. 8

C. 10

D. 12

Answer: Option D

Solution (By JKSSB Mock Tests)

G.M.^5 = 6^5 = 7776. Product of known four = 3*6*4*9 = 648. Fifth = 7776/648 = 12.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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If a woman gave birth to a child at age 30, the birth is counted in ASFR for age group:

A. 20-24

B. 35-39

C. 30-34

D. 25-29

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Correct Answer: Option C

Explanation:
Age 30 falls in the 30-34 age group.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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If Net Reproduction Rate (NRR) < 1, the population in the long run will:

A. Stabilize

B. Fluctuate unpredictably

C. Grow

D. Decline

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Correct Answer: Option D

Explanation:
NRR below 1 indicates that each generation is not replacing itself, leading to eventual population decline.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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The crude birth rate in India has declined primarily due to:

A. Increase in death rate

B. Decrease in female population

C. Increase in migration

D. Family planning and socio-economic development

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Correct Answer: Option D

Explanation:
Awareness, contraception, and rising education have reduced birth rates.

This question belongs to: Accountancy and Statistics Statistics

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