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16-05-2021
Mathematics

contestada

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

Respuesta :

reeserl reeserl

16-05-2021

Answer:

11.8

Step-by-step explanation:

3(12.4) + 6(11.5) = 37.2 + 69 = 106.2

106.2/9 = 11.8

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