The weighted arithmetic mean formula is: MCQ with Answer and Explanation

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The weighted arithmetic mean formula is:

A. Σx / Σw

B. Σw / Σwx

C. Σwx / n

D. Σwx / Σw

Answer: Option D

Solution (By JKSSB Mock Tests)

Weighted mean = Σ(w_i × x_i) / Σ w_i.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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Crude birth rate for a population of 200,000 with 4,000 live births in a year is:

A. 2 per 1000

B. 20 per 1000

C. 0.2 per 1000

D. 50 per 1000

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Correct Answer: Option B

Explanation:
CBR = (4000 / 200000) × 1000 = 0.02 × 1000 = 20 per 1000.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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In a 2×2 contingency table for attributes A and B, the frequency of (Aβ) represents units that:

A. Possess A and B

B. Do not possess A but possess B

C. Possess neither A nor B

D. Possess A but not B

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Correct Answer: Option D

Explanation:
Standard notation: A = presence of attribute A, β = absence of attribute B. Thus, (Aβ) denotes units with attribute A present and attribute B absent.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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If there were 5000 live births in a year and the number of women aged 15-49 was 25,000, the GFR per 1000 women is:

A. 200

B. 5

C. 500

D. 20

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Correct Answer: Option A

Explanation:
GFR = (5000 / 25000) × 1000 = 0.2 × 1000 = 200 per 1000 women.

This question belongs to: Accountancy and Statistics Statistics

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