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

Question Report Error

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

A. Decreases by 5

B. Remains same

C. Increases by 5

D. Becomes 5 times

Answer: Option A

Solution (By JKExamLibrary)

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 Report Error

The complement of the event 'at least one head' in two coin tosses is:

A. Exactly one head

B. No heads (both tails)

C. At least one tail

D. Two heads

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Correct Answer: Option B

Explanation:
Complement of 'at least one head' is 'no heads'.

This question belongs to: Accountancy and Statistics Statistics

Question #2 Report Error

Neonatal deaths are those occurring in the first:

A. 7 days

B. 24 hours

C. 28 days

D. 1 year

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Correct Answer: Option C

Explanation:
Neonatal period = 0-28 days.

This question belongs to: Accountancy and Statistics Statistics

Question #3 Report Error

If the mean of five numbers is 10 and four of them are 8, 9, 11, 12, the fifth number is:

A. 9

B. 8

C. 10

D. 11

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Correct Answer: Option C

Explanation:
Sum = 5×10=50. Sum of four = 8+9+11+12=40. Fifth = 50-40=10.

This question belongs to: Accountancy and Statistics Statistics

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