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. 0.2

B. 0.9

C. 0.7

D. 0.1

Answer: Option B

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

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For two positive numbers, the arithmetic mean is 25 and geometric mean is 20. The harmonic mean is:

A. 18

B. 15

C. 16

D. 22.5

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Correct Answer: Option C

Explanation:
For two numbers, HM = GM² / AM = (20)² / 25 = 400/25 = 16.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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The Sample Registration System (SRS) provides data on:

A. Births and deaths by age, sex, and residence

B. Agricultural output

C. Industrial production

D. Maternal mortality only

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Correct Answer: Option A

Explanation:
SRS generates annual estimates of fertility and mortality indicators.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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The sex ratio (females per 1000 males) in India according to Census 2011 is:

A. 933

B. 943

C. 927

D. 940

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Correct Answer: Option B

Explanation:
India's overall sex ratio in 2011 was 943 females per 1000 males.

This question belongs to: Accountancy and Statistics Statistics

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