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

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The formula for weighted arithmetic mean is:

A. Σwx / Σw

B. Σw / Σx

C. Σx / Σw

D. Σwx / n

Answer: Option A

Solution (By JKExamLibrary)

Weighted mean = Σ(w_i x_i) / Σ w_i.

This question belongs to: Accountancy and Statistics Statistics

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Practice More Statistics Questions

Question #1 Report Error

In demography, 'cohort' refers to:

A. A group of people born in the same year or period

B. A sample of the population

C. All women of reproductive age

D. All people living in a country

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Correct Answer: Option A

Explanation:
A cohort is a group sharing a common temporal experience, like birth year.

This question belongs to: Accountancy and Statistics Statistics

Question #2 Report Error

Which of the following is a necessary condition for consistency of data for two attributes?

A. (A) ≥ (AB)

B. (αβ) ≥ 0

C. All of these

D. (AB) ≥ 0

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Correct Answer: Option C

Explanation:
All ultimate class frequencies must be non-negative, and marginal conditions like (A) ≥ (AB) must hold.

This question belongs to: Accountancy and Statistics Statistics

Question #3 Report Error

Age-specific fertility rate for age group 25-29 is 120 per 1000 women. If there are 15,000 women in this age group, the expected number of births to them is:

A. 1800

B. 1500

C. 2000

D. 1200

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Correct Answer: Option A

Explanation:
Births = ASFR × (number of women) / 1000 = 120 × 15000 / 1000 = 1800.

This question belongs to: Accountancy and Statistics Statistics

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