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

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

A. 0.7

B. 0.12

C. 0.1

D. 0.5

Answer: Option A

Mutually exclusive → P(A∪B) = P(A) + P(B) = 0.3+0.4=0.7.

This question belongs to: Accountancy and Statistics Statistics

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Question #1 Report Error

The average wage of 10 male workers is Rs. 500, and of 10 female workers is Rs. 400. What is the combined mean wage?

A. 450

B. 900

C. 460

D. 440

Correct Answer: Option A

Explanation:
Combined mean = (n1*x1 + n2*x2) / (n1+n2) = (5000 + 4000) / 20 = 450.

This question belongs to: Accountancy and Statistics Statistics

Question #2 Report Error

The term 'ultimate class frequencies' is associated with:

A. Frequency distributions

B. Theory of attributes

C. Demography

D. Index numbers

Correct Answer: Option B

Explanation:
In theory of attributes, ultimate classes are the mutually exclusive categories (AB, Aβ, etc.).

This question belongs to: Accountancy and Statistics Statistics

Question #3 Report Error

Neonatal mortality refers to deaths in the first:

A. 1 year

B. 24 hours

C. 28 days

D. 7 days

Correct Answer: Option C

Explanation:
Neonatal period is 0-28 days.

This question belongs to: Accountancy and Statistics Statistics