Picking a truly random number is harder than you thinkaryna Terletska/Getty ImagesPeople are generally bad at producing random actions, but now it seems that we are all uniquely bad in our own way. This makes it possible to predict how an individual will act randomly, which could have implications for data security and choosing suitably strong passwords.Psychologists already know that we struggle with randomness ask people to name a random colour, and a majority will say blue, while the most frequent answer for a random number between 1 and 10 is 7.