There are different statistics... There was a study that showed that the number of ideas that people had to generate and test in order to have an IPO was 3000. Those are not just ideas that people had, but the number of ideas that people actually did something with, like try to raise money for.
If you are interested in a business rather then an IPO, there are a lot of other statistics. 9 out of 10 businesses fail in the first five yours. 9 out of ten of those that survive fail in the next five years. Once you make it past the 10 year mark your chances get better. That being said, 95% of family owned businesses collapse in the 3rd generation, since usually the 1st generation is the founders, the 2nd generation are the leeches and the 3rd generation are the destroyers.
If you are looking for safety and security, starting your own business is not the safest route. Regardless of the risk, if you are an entrepreneur deep inside, then its the only way to live. You can try to reduce the risk by improving your education, building a wining team and asking for advice in places like this website, but the odds are stacked against you any way you look at it. The good news are that its better then the casinos, since you can win, and it is far more satisfying.