Mathematics · Statistics - Combined Standard Deviation
Two data sets of sizes 6 and 9 have standard deviations of 3 and 4, respectively, and arithmetic means of 4 and 4, respectively. The standard deviation of the combined data set of size 15 is:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1√685
- 2√705
- 3√665✓
- 4√725
Correct answer
√665
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