If P(A) = 0.4, P(B) = 0.5, and P(A ∩ B) = 0.2, then P(A|B) is: MCQ with Answer and Explanation

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If P(A) = 0.4, P(B) = 0.5, and P(A ∩ B) = 0.2, then P(A|B) is:

A. 0.4

B. 0.8

C. 0.5

D. 0.2

Answer: Option A

Solution (By JKSSB Mock Tests)

Conditional probability P(A|B) = P(A ∩ B) / P(B) = 0.2 / 0.5 = 0.4. This represents the probability of A occurring given that B has already occurred.

This question belongs to: Accountancy and Statistics Statistics

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Practice More Statistics Questions

Question #1

Chain base index numbers are constructed using:

A. Fixed base year weights

B. Average of Laspeyres and Paasche

C. Link relatives with shifting base

D. Geometric mean of price relatives only

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Correct Answer: Option C

Explanation:
Chain indices are compiled by linking relative changes (link relatives) where each period is compared with the immediately preceding period.

This question belongs to: Accountancy and Statistics Statistics

Question #2

The dependency ratio measures the ratio of:

A. Non-working age population to working-age population

B. Female to male population

C. Unemployed to employed population

D. Rural to urban population

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Correct Answer: Option A

Explanation:
Dependency ratio = (Population under 15 + Population over 65) / Population aged 15-64.

This question belongs to: Accountancy and Statistics Statistics

Question #3

If Laspeyres price index = 130, Paasche price index = 120, the Fisher index is approximately:

A. 125.5

B. 125.0

C. 124.9

D. 124.5

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Correct Answer: Option C

Explanation:
√(130×120) = √15600 ≈ 124.8999.

This question belongs to: Accountancy and Statistics Statistics

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