A set of values has mean 20. If each value is multiplied by 2 and then 5 is added, the new mean is: MCQ with Answer and Explanation

A set of values has mean 20. If each value is multiplied by 2 and then 5 is added, the new mean is:

A. 50

B. 25

C. 40

D. 45

Answer: Option D

New mean = 2 × 20 + 5 = 45.

This question belongs to: Accountancy and Statistics Statistics

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Question #1 Report Error

Which of the following is NOT a demographic process?

A. Migration

B. Mortality

C. Industrialization

D. Fertility

Correct Answer: Option C

Explanation:
Demographic processes directly change population size and composition; industrialization is an economic process.

This question belongs to: Accountancy and Statistics Statistics

Question #2 Report Error

A box contains 3 defective and 7 non-defective items. Two items are selected at random. The probability that exactly one is defective is:

A. 7/15

B. 14/45

C. 21/45

D. 1/5

Correct Answer: Option A

Explanation:
Total C(10,2)=45. Favorable: 3×7=21. Probability=21/45=7/15.

This question belongs to: Accountancy and Statistics Statistics

Question #3 Report Error

The index that measures changes in retail prices for industrial workers is:

A. CPI-AL

B. CPI-IW

C. GDP deflator

D. WPI

Correct Answer: Option B

Explanation:
Consumer Price Index for Industrial Workers (CPI-IW) is designed to measure the cost of living for working-class families.

This question belongs to: Accountancy and Statistics Statistics