If the mean of two samples of sizes 20 and 30 are 25 and 10 respectively, their variances are 9 and 16…

If the mean of two samples of sizes 20 and 30 are 25 and 10 respectively, their variances are 9 and 16 respectively, their combined variance is
  1. $67.9$
  2. $68.2$
  3. $68.1$
  4. $67.2$

Solution

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Asked in: AP EAMCET 2020 (07 Oct Special)

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