One out of five VS One in five...What's the difference? SCRIPT #1. - One out of five page views in the US occurs on Facebook - One out of Five Americans Do Not Believe Obama Exists (from various heads of news) #2. - One in five women in Seoul have gone under the knife as South Korea tops global list of plastic surgery procedures (from a head of news) QUESTION I've always wondered how differ they are. Would you explain to me witm some examples? Thanks!