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If the mean of 16 observations is 60 and the mean of other 13 observations is 75, then their combined…

The combined mean is \(\bar{X} = \frac{n_1\bar{x}_1 + n_2\bar{x}_2}{n_1 + n_2} = \frac{16 \times 60 + 13 \times 75}{16 + 13} = \frac{960 + 975}{29} = \frac{1935}{29} \approx…

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If the mean of 16 observations is 60 and the mean of other 13 observations is 75, then their combined mean is -

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The combined mean is Xˉ=n1xˉ1+n2xˉ2n1+n2=16×60+13×7516+13=960+97529=193529≈66.72\bar{X} = \frac{n_1\bar{x}_1 + n_2\bar{x}_2}{n_1 + n_2} = \frac{16 \times 60 + 13 \times 75}{16 + 13} = \frac{960 + 975}{29} = \frac{1935}{29} \approx 66.72.

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