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

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The formula for weighted arithmetic mean is:

A. Σw / Σx

B. Σwx / Σw

C. Σwx / n

D. Σx / Σw

Answer: Option B

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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The combined mean of three groups with means 20, 30, 40 and sizes 10, 15, 25 is:

A. 32

B. 33

C. 35

D. 30

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Correct Answer: Option B

Explanation:
Sum = 200+450+1000=1650, N=50, Mean=33.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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The 'weight' in a weighted index number should ideally represent:

A. Base year price

B. Price of the item

C. Relative importance of the item

D. Unit of measurement

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Correct Answer: Option C

Explanation:
Weights reflect the relative significance of commodities in the basket.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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Which index satisfies both time reversal and factor reversal tests?

A. Simple aggregative

B. Laspeyres

C. Paasche

D. Fisher

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Correct Answer: Option D

Explanation:
Only Fisher's ideal index satisfies both tests.

This question belongs to: Accountancy and Statistics Statistics

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