In a frequency distribution, the number of observations falling in a class is called: MCQ with Answer and Explanation

In a frequency distribution, the number of observations falling in a class is called:

A. Class limit

B. Class frequency

C. Class mark

D. Class width

Answer: Option B

Class frequency is the count of data points within a particular class interval.

This question belongs to: Accountancy and Statistics Statistics

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Question #1 Report Error

If N = 100, (A) = 60, (B) = 50, what is the condition for attributes A and B to be independent?

A. (AB) = 110

B. (AB) = 30

C. (AB) = 10

D. (AB) = 0

Correct Answer: Option B

Explanation:
Two attributes are independent if (AB) = (A) × (B) / N. Here, (60 × 50) / 100 = 30.

This question belongs to: Accountancy and Statistics Statistics

Question #2 Report Error

In attributes, if (A)=70, (B)=50, (αβ)=10, and N=100, then (AB) is:

A. 40

B. 10

C. 20

D. 30

Correct Answer: Option D

Explanation:
(αβ)= N - (A) - (B) + (AB) ⇒ 10 = 100 -70 -50 + (AB) ⇒ (AB)=30.

This question belongs to: Accountancy and Statistics Statistics

Question #3 Report Error

The combined mean of two groups of sizes n₁ and n₂ with means x̄₁ and x̄₂ is given by:

A. (x̄₁/x̄₂) × (n₁ + n₂)

B. (n₁x̄₁ + n₂x̄₂)/(n₁ + n₂)

C. (n₁x̄₁ + n₂x̄₂)/2

D. (x̄₁ + x̄₂)/2

Correct Answer: Option B

Explanation:
Combined mean is a weighted average.

This question belongs to: Accountancy and Statistics Statistics