The combined mean of three groups with means 20, 30, 40 and sizes 10, 15, 25 is: MCQ with Answer and Explanation

The combined mean of three groups with means 20, 30, 40 and sizes 10, 15, 25 is:

A. 32

B. 33

C. 30

D. 35

Answer: Option B

Sum = 200+450+1000=1650, N=50, Mean=33.

This question belongs to: Accountancy and Statistics Statistics

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Question #1 Report Error

If the price index for 2021 (base 2020) is 110 and for 2022 (base 2021) is 105, the chain index for 2022 with base 2020 is:

A. 105.0

B. 115.5

C. 115.0

D. 110.0

Correct Answer: Option B

Explanation:
Chain index = 110 × (105/100) = 115.5.

This question belongs to: Accountancy and Statistics Statistics

Question #2 Report Error

Which of the following is NOT a source of demographic data?

A. Civil registration system

B. Census

C. Sample surveys like NFHS

D. Stock exchange reports

Correct Answer: Option D

Explanation:
Stock exchange reports provide financial data, not population statistics.

This question belongs to: Accountancy and Statistics Statistics

Question #3 Report Error

Which of the following is an example of secondary data?

A. Interviews conducted by a journalist

B. Observations recorded in a lab experiment

C. Data obtained from the Census of India website for a research paper

D. Data collected by a student for her project through a survey

Correct Answer: Option C

Explanation:
Data already published is secondary.

This question belongs to: Accountancy and Statistics Statistics