If a constant is subtracted from all observations, the arithmetic mean: MCQ with Answer and Explanation

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If a constant is subtracted from all observations, the arithmetic mean:

A. Becomes zero

B. Decreases by the same constant

C. Increases by the constant

D. Remains the same

Answer: Option B

Solution (By JKSSB Mock Tests)

Mean changes by the same amount as the change in origin.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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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) = 110

B. (AB) = 10

C. (AB) = 30

D. (AB) = 0

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Correct Answer: Option C

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

This question belongs to: Accountancy and Statistics Statistics

Question #2

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The TFR is expressed as:

A. Deaths per 1000 live births

B. Population per sq km

C. Children per woman

D. Births per 1000 women

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Correct Answer: Option C

Explanation:
Total Fertility Rate is the average number of children a woman would bear.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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Infant mortality rate is high in regions with:

A. High literacy

B. Good healthcare

C. Low fertility

D. Poor sanitation and malnutrition

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Correct Answer: Option D

Explanation:
Poor health infrastructure and nutrition lead to higher infant deaths.

This question belongs to: Accountancy and Statistics Statistics

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