Hakim recorded his finishing time, in seconds, for each time he ran the 100 m race during one track season.

what was the median of his finishing times?

12.0, 12.4, 11.9, 12.1, 12.2, 12.4, 12.1, 12.3, 11.9

Its 12.1. it is the middle number from largest to least value.

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post