If P(A)=0.4, P(B)=0.3, and A, B are mutually exclusive, then P(A∪B) is: MCQ with Answer and Explanation

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If P(A)=0.4, P(B)=0.3, and A, B are mutually exclusive, then P(A∪B) is:

A. 0.1

B. 0.12

C. 0.7

D. 0.58

Answer: Option C

Solution (By JKSSB Mock Tests)

P(A∪B) = P(A)+P(B) = 0.4+0.3=0.7.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

The sex ratio of India according to Census 2011 is:

A. 940

B. 933

C. 943

D. 925

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Correct Answer: Option C

Explanation:
Sex ratio was 943 females per 1000 males.

This question belongs to: Accountancy and Statistics Statistics

Question #2

In attributes, if (AB)=30, (A)=40, (B)=50, N=100, the expected frequency under independence is:

A. 15

B. 25

C. 30

D. 20

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Correct Answer: Option D

Explanation:
Expected (AB) = (40×50)/100 = 20.

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Question #3

The harmonic mean of 2, 3, and 6 is:

A. 3

B. 3.6

C. 3.27

D. 2.8

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Correct Answer: Option A

Explanation:
Reciprocals: 1/2, 1/3, 1/6. Sum = 1. AM of reciprocals = 1/3. HM = 1/(1/3) = 3.

This question belongs to: Accountancy and Statistics Statistics

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