The weighted arithmetic mean is calculated as: MCQ with Answer and Explanation

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The weighted arithmetic mean is calculated as:

A. Σx / n

B. √(Πx)

C. n / Σ(1/x)

D. Σ(wx) / Σw

Answer: Option D

Solution (By JKSSB Mock Tests)

Weighted mean = sum of (value × weight) divided by sum of weights, allowing differential importance of observations, e.g., in index numbers or survey sampling.

This question belongs to: Accountancy and Statistics Statistics

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Practice More Statistics Questions

Question #1

In a random experiment, the set of all possible outcomes is called:

A. Outcome set

B. Event

C. Trial

D. Sample space

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Correct Answer: Option D

Explanation:
Sample space is the collection of all elementary outcomes of an experiment.

This question belongs to: Accountancy and Statistics Statistics

Question #2

Age-Specific Fertility Rate for 25-29 years is 120 per 1,000 women. This means:

A. 12% of women aged 25-29 give birth each year

B. For every 1,000 women aged 25-29, there are 120 live births in a year

C. Women in this age group have 120 children on average

D. 120 is the total fertility rate contribution from this age group

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Correct Answer: Option B

Explanation:
ASFR = (Births to women in age group / Women in age group) × 1,000. An ASFR of 120 indicates 120 annual births per 1,000 women aged 25-29, reflecting age-specific fertility intensity.

This question belongs to: Accountancy and Statistics Statistics

Question #3

The mode is the value that:

A. Is the average

B. Is the midpoint

C. Occurs most frequently

D. Divides data into two equal parts

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Correct Answer: Option C

Explanation:
Mode is the most common observation.

This question belongs to: Accountancy and Statistics Statistics

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