If every observation in a dataset is doubled, the arithmetic mean: MCQ with Answer and Explanation

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If every observation in a dataset is doubled, the arithmetic mean:

A. Remains unchanged

B. Increases by 2

C. Is also doubled

D. Becomes half

Answer: Option C

Solution (By JKSSB Mock Tests)

Mean is affected by change of scale; multiplying by 2 scales the mean by 2.

This question belongs to: Accountancy and Statistics Statistics

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Practice More Statistics Questions

Question #1

If (AB)=0, then the association between A and B indicates:

A. Positive association

B. Complete independence

C. No conclusion

D. Complete disassociation (perfect negative)

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Correct Answer: Option D

Explanation:
(AB)=0 means the two attributes never occur together, indicating complete negative association (disassociation).

This question belongs to: Accountancy and Statistics Statistics

Question #2

Assertion (A): Fisher's Index is called the 'Ideal' index. Reason (R): It uses only base year quantities.

A. A is false but R is true

B. Both A and R are true but R is NOT the correct explanation

C. A is true but R is false

D. Both A and R are true and R is the correct explanation

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Correct Answer: Option C

Explanation:
A is true, but R is false because Fisher's index uses both base and current year quantities (Geometric mean of L and P).

This question belongs to: Accountancy and Statistics Statistics

Question #3

The neonatal mortality rate (NMR) in India has declined but still accounts for what proportion of infant deaths?

A. 90%

B. About two-thirds

C. Half

D. About one-third

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Correct Answer: Option B

Explanation:
Neonatal deaths (first 28 days) constitute about 60-70% of infant deaths in India.

This question belongs to: Accountancy and Statistics Statistics

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