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A sample of 35 observations has the mean 80 and standard deviation as 4. A second sample of 65 observations from the same population has mean 60 and standard deviation 3. Then the standard deviation of the combined sample is |
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Answer» A sample of 35 observations has the mean 80 and standard deviation as 4. A second sample of 65 observations from the same population has mean 60 and standard deviation 3. Then the standard deviation of the combined sample is |
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