Weighted mean is used when: MCQ with Answer and Explanation

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Weighted mean is used when:

A. Data are qualitative

B. Distribution is symmetric

C. Different observations have different importance

D. All observations are equal

Answer: Option C

Solution (By JKSSB Mock Tests)

Weighted mean assigns weights to reflect the varying importance of items.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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The Total Fertility Rate (TFR) is expressed as:

A. Percentage

B. Live births per 1000 women

C. Children per woman

D. Daughters per woman

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Correct Answer: Option C

Explanation:
TFR is the average number of children a woman would have.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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If P(A) = 0.6, P(B) = 0.3, and P(A ∩ B) = 0.18, then events A and B are:

A. Exhaustive

B. Independent

C. Mutually exclusive

D. Dependent

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Correct Answer: Option B

Explanation:
Events are independent if P(A ∩ B) = P(A) × P(B). Here, 0.6 × 0.3 = 0.18, satisfying the condition.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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The algebraic sum of the deviations of a set of values from their arithmetic mean is always:

A. Negative

B. Minimum

C. Positive

D. Zero

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Correct Answer: Option D

Explanation:
A fundamental property of the arithmetic mean is that the sum of deviations of items from the mean is identically zero.

This question belongs to: Accountancy and Statistics Statistics

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