Question

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

Answer 1

Answer:

11.8

Step-by-step explanation:

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

106.2/9 = 11.8