If the occurrence of event A does not affect the probability of event B, then A and B are: MCQ with Answer and Explanation

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If the occurrence of event A does not affect the probability of event B, then A and B are:

A. Dependent

B. Independent

C. Mutually exclusive

D. Equally likely

Answer: Option B

Solution (By JKSSB Mock Tests)

Independence means P(B|A) = P(B).

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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In a frequency distribution, the cumulative frequency of the last class is equal to:

A. Zero

B. Class width

C. Number of classes

D. Total frequency N

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Correct Answer: Option D

Explanation:
Cumulative frequency accumulates all frequencies; the last cumulative frequency equals total frequency.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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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. 0.1

B. 0.2

C. 0.3

D. 0.9

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Correct Answer: Option C

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 #3

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When rolling a fair die, the probability of getting a number greater than 4 is:

A. 1/2

B. 2/3

C. 1/3

D. 1/6

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Correct Answer: Option C

Explanation:
Numbers >4 are 5,6 → 2 out of 6 → probability = 1/3.

This question belongs to: Accountancy and Statistics Statistics

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