Combined mean formula is essential when: MCQ with Answer and Explanation

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Combined mean formula is essential when:

A. Calculating mode

B. All groups have the same size

C. Merging means from groups of different sizes

D. Data is qualitative

Answer: Option C

Solution (By JKSSB Mock Tests)

Combined mean = (n₁x̄₁ + n₂x̄₂) / (n₁ + n₂) weights each group's mean by its size, providing the correct overall mean when aggregating subgroup statistics.

This question belongs to: Accountancy and Statistics Statistics

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Practice More Statistics Questions

Question #1

Two events A and B are such that P(A)=0.5, P(B)=0.3, P(A∩B)=0.1. They are:

A. Neither mutually exclusive nor independent

B. Independent

C. Mutually exclusive

D. Both mutually exclusive and independent

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Correct Answer: Option A

Explanation:
P(A∩B)≠0 ⇒ not mutually exclusive. P(A)P(B)=0.15 ≠ 0.1 ⇒ not independent.

This question belongs to: Accountancy and Statistics Statistics

Question #2

The method of collecting primary data where the informant is contacted through telephone is called:

A. Telephonic interview

B. Indirect oral investigation

C. Direct personal interview

D. Mailed questionnaire

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Correct Answer: Option A

Explanation:
Telephonic interview involves asking questions over the phone.

This question belongs to: Accountancy and Statistics Statistics

Question #3

Crude Birth Rate is the number of live births per ______ population in a year.

A. 10,000

B. 1000

C. 100,000

D. 100

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Correct Answer: Option B

Explanation:
CBR = (Live births / Mid-year total population) × 1000.

This question belongs to: Accountancy and Statistics Statistics

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