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

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The weighted arithmetic mean formula is:

A. Σwx / n

B. Σw / Σwx

C. Σwx / Σw

D. Σx / Σw

Answer: Option C

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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For two independent events A and B, P(A)=0.2, P(B)=0.5. P(A∪B) is:

A. 0.5

B. 0.7

C. 0.6

D. 0.1

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Correct Answer: Option C

Explanation:
P(A∪B) = 0.2+0.5 - (0.2×0.5) = 0.7 - 0.1 = 0.6.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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If a dataset has mean = 25 and median = 25, the distribution is likely:

A. Negatively skewed

B. Cannot say

C. Symmetric

D. Positively skewed

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Correct Answer: Option C

Explanation:
Mean = Median suggests symmetry, but not guaranteed without mode; however, in many contexts it indicates symmetry.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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The main disadvantage of direct observation method is:

A. High cost

B. Limited to observable behavior, cannot capture attitudes

C. Low accuracy

D. High non-response

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Correct Answer: Option B

Explanation:
Observation only records external actions; it cannot reveal opinions, motives, or internal states.

This question belongs to: Accountancy and Statistics Statistics

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