If N = 100, (A) = 60, (B) = 50, what is the condition for attributes A and B to be independent? MCQ with Answer and Explanation

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If N = 100, (A) = 60, (B) = 50, what is the condition for attributes A and B to be independent?

A. (AB) = 10

B. (AB) = 0

C. (AB) = 30

D. (AB) = 110

Answer: Option C

Solution (By JKSSB Mock Tests)

Two attributes are independent if (AB) = (A) × (B) / N. Here, (60 × 50) / 100 = 30.

This question belongs to: Accountancy and Statistics Statistics

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Gross Reproduction Rate (GRR) is calculated as TFR multiplied by:

A. Proportion of male births

B. Inverse of sex ratio

C. Proportion of female births

D. Life expectancy at birth

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Correct Answer: Option C

Explanation:
GRR = TFR × (female births / total births), representing the average number of daughters a woman would have.

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Question #2

If the sum of 50 observations is 500, the arithmetic mean is 10. If each observation is multiplied by 3, the new mean is:

A. 300

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C. 13

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Correct Answer: Option B

Explanation:
Mean scales by the same factor.

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Question #3

Infant Mortality Rate (IMR) of 30 per 1,000 live births means:

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B. 3% of infants die before age 1

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Correct Answer: Option A

Explanation:
IMR = (Infant deaths / Live births) × 1,000. An IMR of 30 indicates 30 infant deaths per 1,000 live births, a key indicator of child health and healthcare system performance.

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