The arithmetic mean of first n natural numbers is: MCQ with Answer and Explanation

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The arithmetic mean of first n natural numbers is:

A. n/2

B. 2n+1

C. n(n+1)/2

D. (n+1)/2

Answer: Option D

Solution (By JKSSB Mock Tests)

Sum = n(n+1)/2, mean = (n+1)/2.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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Life expectancy at birth is a summary measure of:

A. Fertility

B. Migration

C. Nuptiality

D. Mortality

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Correct Answer: Option D

Explanation:
Life expectancy is derived from age-specific mortality rates and reflects overall mortality conditions.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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In the theory of attributes, the total number of objects N is equal to:

A. (AB)+(Aβ)+(αB)+(αβ)

B. (A)+(B)-(AB)

C. (A)+(α)

D. Both A and B

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Correct Answer: Option D

Explanation:
Both identities hold; (A)+(α)=N, and the sum of ultimate class frequencies also equals N.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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Perinatal Mortality Rate is particularly useful for evaluating:

A. Chronic disease management

B. Adolescent health programs

C. Long-term elderly care

D. Quality of antenatal and intrapartum care

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Correct Answer: Option D

Explanation:
Perinatal mortality (late fetal + early neonatal deaths) is closely linked to obstetric care quality, making it a key metric for assessing maternal and newborn health services around childbirth.

This question belongs to: Accountancy and Statistics Statistics

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