If (A)=80, (B)=60, N=100, and (AB)=50, the value of (Aβ) is: MCQ with Answer and Explanation

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If (A)=80, (B)=60, N=100, and (AB)=50, the value of (Aβ) is:

A. 20

B. 10

C. 30

D. 40

Answer: Option C

Solution (By JKSSB Mock Tests)

(Aβ) = (A) - (AB) = 80 - 50 = 30.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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The combined mean of two groups of sizes n₁ and n₂ with means x̄₁ and x̄₂ is given by:

A. (n₁x̄₁ + n₂x̄₂)/2

B. (x̄₁ + x̄₂)/2

C. (n₁x̄₁ + n₂x̄₂)/(n₁ + n₂)

D. (x̄₁/x̄₂) × (n₁ + n₂)

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Correct Answer: Option C

Explanation:
Combined mean is a weighted average.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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Which of the following is a merit of secondary data?

A. Originality

B. Specific to research objectives

C. High accuracy

D. Saves time and cost

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Correct Answer: Option D

Explanation:
Secondary data is already available, saving the time and expense of collection.

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Question #3

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Data on 'Religion of individuals' (Hindu, Muslim, Christian, etc.) is an example of:

A. Quantitative classification

B. Qualitative classification

C. Spatial classification

D. Chronological classification

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Correct Answer: Option B

Explanation:
Religion is an attribute, not a numerical value, so grouping by religion is a qualitative (descriptive) classification.

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