If a constant 5 is subtracted from all observations, the arithmetic mean: MCQ with Answer and Explanation

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If a constant 5 is subtracted from all observations, the arithmetic mean:

A. Decreases by 5

B. Increases by 5

C. Becomes 5 times

D. Remains same

Answer: Option A

Solution (By JKSSB Mock Tests)

Mean is affected by change of origin; subtracting 5 reduces mean by 5.

This question belongs to: Accountancy and Statistics Statistics

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Practice More Statistics Questions

Question #1

Two dice are thrown simultaneously. The probability of getting a sum of 7 is:

A. 1/6

B. 7/36

C. 1/36

D. 1/12

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Correct Answer: Option A

Explanation:
Favorable outcomes: (1,6), (2,5), (3,4), (4,3), (5,2), (6,1) = 6. Total outcomes = 36. Prob = 6/36 = 1/6.

This question belongs to: Accountancy and Statistics Statistics

Question #2

A major disadvantage of secondary data is:

A. May not suit the present research objective

B. Originality

C. Time consuming

D. High cost

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Correct Answer: Option A

Explanation:
Secondary data was collected for a different purpose; definitions and coverage may differ.

This question belongs to: Accountancy and Statistics Statistics

Question #3

The crude death rate of a population is 7 per 1000 and the population is 10 million. The estimated number of deaths in a year is:

A. 70,000

B. 7,000

C. 700,000

D. 700

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Correct Answer: Option A

Explanation:
Deaths = (7/1000) × 10,000,000 = 70,000.

This question belongs to: Accountancy and Statistics Statistics

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