Using proportions, it is found that the fraction of players who don't stretch that get injured is: [tex]\frac{5}{6}[/tex]
A proportion is a fraction of a total amount, and the measures are related using a rule of three.
From the data given, there are 50 - 32 = 18 footballers who do not stretch regularly, and of those 19 - 4 = 15 stretched, hence the fraction of players who don't stretch that get injured is:
[tex]f = \frac{15}{18} = \frac{5}{6}[/tex]
More can be learned about proportions at https://brainly.com/question/24372153
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