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

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

A. 0.58

B. 0.7

C. 0.1

D. 0.12

Answer: Option B

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 Report Error

According to Sturges' rule, the approximate number of classes for n = 50 is: (Use k = 1 + 3.322 log₁₀ n)

A. 8

B. 7

C. 5

D. 6

Correct Answer: Option B

Explanation:
log₁₀50 ≈ 1.699; 3.322 × 1.699 ≈ 5.64; 1 + 5.64 = 6.64, which rounds to 7 classes.

This question belongs to: Accountancy and Statistics Statistics

Question #2 Report Error

Which part of a statistical table provides an explanation of the abbreviations or symbols used in the table?

A. Footnote

B. Headnote

C. Stub

D. Title

Correct Answer: Option A

Explanation:
Footnotes are placed at the bottom of the table to clarify any specific entries, symbols, or abbreviations.

This question belongs to: Accountancy and Statistics Statistics

Question #3 Report Error

If class intervals are inclusive, before plotting a histogram we must:

A. Convert them to exclusive by adjusting boundaries

B. Plot directly

C. Change class width

D. Use cumulative frequencies

Correct Answer: Option A

Explanation:
Inclusive intervals have gaps; adjusting by half of the gap makes them continuous.

This question belongs to: Accountancy and Statistics Statistics