1 in 5 means that in every 5 of an event, one is likely to do something (whatever the question refers to).
For example: If a question was, if 1 in 5 people at a bar walk out sobre, how many people are sobre if 100 people walk into the bar. Well, 1 in 5 is also 20%, so 20% of 100 = 20 people.
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