For two attributes A and B, if (A)=80, (B)=70, N=100, and they are independent, then (AB) should be: MCQ with Answer and Explanation

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For two attributes A and B, if (A)=80, (B)=70, N=100, and they are independent, then (AB) should be:

A. 80

B. 56

C. 50

D. 70

Answer: Option B

Solution (By JKSSB Mock Tests)

Expected (AB) = (80×70)/100 = 56.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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Which fertility measure accounts for the age structure of the female population in the reproductive age group?

A. Age Specific Fertility Rate

B. General Fertility Rate

C. Gross Reproduction Rate

D. Crude Birth Rate

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Correct Answer: Option A

Explanation:
Age Specific Fertility Rate (ASFR) calculates fertility for specific age groups of women, removing the bias of age structure.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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If Net Reproduction Rate (NRR) = 1.2, it means:

A. The infant mortality rate is zero.

B. The population has reached replacement level.

C. Each generation is replacing itself and increasing by 20%.

D. The population will immediately decline.

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Correct Answer: Option C

Explanation:
NRR > 1 indicates the next generation is larger by 20%, leading to population growth.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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Given P(A)=0.5, P(B)=0.3, P(A∩B)=0.1. Are A and B independent?

A. No, because 0.1 ≠ 0.15

B. Cannot determine

C. Yes, because P(A∩B)=P(A)P(B)

D. Yes, because they are mutually exclusive

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Correct Answer: Option A

Explanation:
P(A)P(B)=0.5×0.3=0.15 ≠ 0.1, so not independent.

This question belongs to: Accountancy and Statistics Statistics

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