The mean of 10 observations is 25. If one observation is removed, mean becomes 24. Find removed value.
34
The total sum of the original 10 observations is \(10 \times 25 = 250\).
After removing one observation, there are 9 observations left with mean 24, so their sum is \(9 \times 24 = 216\).
The removed value equals the difference between the two sums: \(250 - 216 = 34\).
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