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Class 9 Mathematics Medium Mcq English Medium

Groups with averages 25 and 35 have 3 and 6 observations. What is the combined average?

Question
Groups with averages 25 and 35 have 3 and 6 observations. What is the combined average?
60
31.67
9
30.00
Answer
31.67
Detailed Explanation
The combined mean is the weighted average using the two group sizes. — Examisthan.com
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