Given P(A)=0.4, P(B)=0.5, and A and B are mutually exclusive, P(A∪B) is: MCQ with Answer and Explanation

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Given P(A)=0.4, P(B)=0.5, and A and B are mutually exclusive, P(A∪B) is:

A. 0.7

B. 0.2

C. 0.1

D. 0.9

Answer: Option D

Solution (By JKSSB Mock Tests)

Mutually exclusive ⇒ P(A∪B) = P(A)+P(B) = 0.4+0.5=0.9.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

The Laspeyres index formula is:

A. Σp₁q₁ / Σp₀q₁ × 100

B. Σp₁q₀ / Σp₀q₀ × 100

C. √( Σp₁q₀/Σp₀q₀ × Σp₁q₁/Σp₀q₁ ) × 100

D. Σp₁q₁ / Σp₀q₀ × 100

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Correct Answer: Option B

Explanation:
Laspeyres uses base period weights.

This question belongs to: Accountancy and Statistics Statistics

Question #2

In the theory of attributes, the class frequency (Aβ) represents:

A. Number possessing A but not B

B. Number possessing neither

C. Number possessing A and B

D. Number not possessing A but possessing B

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Correct Answer: Option A

Explanation:
β indicates absence of B; (Aβ) = items with A and without B.

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Question #3

Infant mortality rate and life expectancy at birth are generally:

A. Equal

B. Negatively correlated

C. Positively correlated

D. Uncorrelated

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Correct Answer: Option B

Explanation:
Higher IMR is associated with lower life expectancy.

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