"What percentage of athletes do researchers think try to hide their concussion symptoms from their coach?"

The percentage of athletes that researchers think try to hide their concussion symptoms from their coach is 40 percent.

Explanation:

The tendency of athletes of not paying much attention to concussion symptoms in order to stay on the field and contribute to winning the competition often makes them hide their symptoms from the coach believing that the coach would no longer allow them to stay on the field. About 60 percent of athletes understand that these symptoms and the ignorance towards them can prove fatal and take the necessary measures once the symptoms are encountered. But about 40 percent of athletes choose to hide it from the coach.

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