showbiz gossip straight to your inbox with the Daily Star's FREE newsletterRight Said Fred stars got roasted all over Twitter after their Covid-19 statistics joke failed to land, but people are still doubting the brothers’ tweet really was a joke, rather than an embarrassing maths blunder.On Thursday morning, London-based Europop group took on Twitter to retweet a statistic report shared on Sky News’ official Twitter page.The study revealed that people who are vaccinated against Covid-19, are 47 per cent less likely to develop long Covid if they contract the virus.Fred and Richard Fairbrass retweeted Sky News’ report and wrote: “So 53% more likely?