Weighted mean is used when: MCQ with Answer and Explanation

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Weighted mean is used when:

A. Different observations have different importance

B. Distribution is symmetric

C. Data are qualitative

D. All observations are equal

Answer: Option A

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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If P(A)=0.4, P(B)=0.5, and A and B are independent, then P(A' ∩ B') equals:

A. 0.2

B. 0.3

C. 0.9

D. 0.1

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Correct Answer: Option B

Explanation:
P(A')=0.6, P(B')=0.5, independence ⇒ P(A'∩B') = 0.6 × 0.5 = 0.3.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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Cumulative frequency for a class interval represents:

A. The average frequency across all classes

B. The sum of frequencies of all classes up to and including that class

C. The difference between the upper and lower class limits

D. The frequency of that class only

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Correct Answer: Option B

Explanation:
Cumulative frequency is the running total of frequencies, calculated by adding the frequency of each class to the sum of frequencies of all preceding classes, useful for percentile calculations.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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The Total Fertility Rate (TFR) is expressed as:

A. Daughters per woman

B. Percentage

C. Children per woman

D. Live births per 1000 women

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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

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