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In a race the mean time for three runners is 12.4 seconds and the mean time for another six runners was 11.5 seconds. Calculate the mean time for all nine runners.

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I think the answer would be 23.9 because if you 12.4 with 11.5 you would get 23.9.
bossgirl101
The answer would be 23.9 seconds because you add the mean time of the 3 runners and the 6 other runners and get this answer

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