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7 March, 05:58

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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Answers (2)
  1. 7 March, 06:25
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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.
  2. 7 March, 06:50
    0
    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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