What percentage of the total students chose skateboarding?

I FOUND YOUR COMPLETE QUESTION IN OTHER SOURCES.
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 For this case, the first thing we are going to do is add the number of students in each of the disciplines.
 We have then:
 walk = 9
 bike = 8
 skateboard = 3
 Total: 20
 The percentage sought is then:
 (3/20) * (100) = 15%
 
 percentage of the total students chose skateboarding is:
 D.) none of these

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