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. 10

B. 25

C. 20

D. 15

Answer: Option D

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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Correct Answer: Option D

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Correct Answer: Option B

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