That is not even close to 'most people are inumerate' that is at best showing financial illiteracy, which is something completely diferent and largely by desogned obfiscation and the impact of perception of loss and how gambling is so successful at keeping folks hooked Nothing to do with basic
Numeracy. This is akin to saying people are mostly illiterate because they don't read Chaucer.
What you are trying to use is a psychology definition of numeracy instead of an actual definition of numeracy. Most people can do basic maths and arithmetic all day long but psychologists try and skew that definition by adding risk / reward or other factors. That conflates a whole swathe of things