If each of 20 values is increased by 10, the arithmetic mean will: MCQ with Answer and Explanation

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If each of 20 values is increased by 10, the arithmetic mean will:

A. Remain unchanged

B. Increase by 10

C. Increase by 200

D. Increase by 20

Answer: Option B

Solution (By JKSSB Mock Tests)

Adding a constant to all observations increases the mean by the same constant.

This question belongs to: Accountancy and Statistics Statistics

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Practice More Statistics Questions

Question #1

If Net Reproduction Rate (NRR) < 1, the population in the long run will:

A. Decline

B. Stabilize

C. Grow

D. Fluctuate unpredictably

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Correct Answer: Option A

Explanation:
NRR below 1 indicates that each generation is not replacing itself, leading to eventual population decline.

This question belongs to: Accountancy and Statistics Statistics

Question #2

Vital statistics are derived primarily from:

A. Agricultural censuses

B. Stock market indices

C. Civil registration systems

D. Industrial surveys

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Correct Answer: Option C

Explanation:
The continuous, permanent, and compulsory recording of vital events (births, deaths) happens via civil registration.

This question belongs to: Accountancy and Statistics Statistics

Question #3

The total of all frequencies in a frequency distribution is equal to the:

A. Mean of the frequencies

B. Width of the highest class

C. Highest cumulative frequency

D. Class mark of the last class

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Correct Answer: Option C

Explanation:
In a 'less than' cumulative frequency distribution, the final cumulative frequency equals the total number of observations (N).

This question belongs to: Accountancy and Statistics Statistics

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