If P(A)=0.7, P(B)=0.6, and P(A∪B)=0.9, then P(A∩B) is: MCQ with Answer and Explanation

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If P(A)=0.7, P(B)=0.6, and P(A∪B)=0.9, then P(A∩B) is:

A. 0.3

B. 0.42

C. 0.6

D. 0.4

Answer: Option D

Solution (By JKSSB Mock Tests)

P(A∩B) = P(A)+P(B)-P(A∪B) = 0.7+0.6-0.9 = 0.4.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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If the crude birth rate of a country is 25 and crude death rate is 10, and net migration rate is -2 per 1000, the growth rate is:

A. 13 per 1000

B. 15 per 1000

C. 17 per 1000

D. 37 per 1000

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Correct Answer: Option A

Explanation:
Growth rate = 25 - 10 + (-2) = 13 per 1000.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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A researcher wants to ensure every individual in a population has an equal chance of being selected. She should use:

A. Quota sampling

B. Purposive sampling

C. Snowball sampling

D. Simple random sampling

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Correct Answer: Option D

Explanation:
Simple random sampling gives each member an equal probability of selection.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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

A. 1000

B. 100

C. 100,000

D. 10,000

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Correct Answer: Option A

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

This question belongs to: Accountancy and Statistics Statistics

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