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7 December, 15:23

If the mean for a sample of 8 people was 10 and the mean for a second sample of 4 people was 20, what would the weighted mean be equal to?

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  1. 7 December, 15:35
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    Weighted mean = (8*10+4*20) / (8+4) = 160/12 = 40/3 ≈ 13.3
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