If the arithmetic mean of 10 numbers is 40 and the mean of the same numbers after subtracting a constant from each is 25, the constant subtracted was: MCQ with Answer and Explanation

Question

If the arithmetic mean of 10 numbers is 40 and the mean of the same numbers after subtracting a constant from each is 25, the constant subtracted was:

A. 25

B. 10

C. 15

D. 20

Answer: Option C

Solution (By JKSSB Mock Tests)

New mean = old mean - constant ⇒ 25 = 40 - k ⇒ k = 15.

This question belongs to: Accountancy and Statistics Statistics

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Chain base index numbers are calculated by:

A. Using geometric mean of prices only

B. Fixing one base period for all comparisons

C. Averaging fixed base indices

D. Using the previous period as base for each link

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Correct Answer: Option D

Explanation:
Chain indices compute period-to-period changes (e.g., 2021/2020, 2022/2021) and chain them multiplicatively, allowing flexibility but complicating long-term interpretation due to changing bases.

This question belongs to: Accountancy and Statistics Statistics