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

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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. 20

B. 15

C. 10

D. 25

Answer: Option B

Solution (By JKExamLibrary)

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

This question belongs to: Accountancy and Statistics Statistics

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The average wage of 10 male workers is Rs. 500, and of 10 female workers is Rs. 400. What is the combined mean wage?

A. 450

B. 900

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Perinatal mortality rate includes deaths from:

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