If the arithmetic mean of 5 numbers is 20, and the arithmetic mean of another 3 numbers is 28, the combined mean of all 8 numbers is: MCQ with Answer and Explanation

Question

If the arithmetic mean of 5 numbers is 20, and the arithmetic mean of another 3 numbers is 28, the combined mean of all 8 numbers is:

A. 23

B. 25

C. 22

D. 24

Answer: Option A

Solution (By JKSSB Mock Tests)

Combined mean = (5×20 + 3×28) / (5+3) = (100 + 84) / 8 = 184 / 8 = 23. This formula weights each group's mean by its size.

This question belongs to: Accountancy and Statistics Statistics

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Correct Answer: Option A

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