The phrase "cent chance" means a very small possibility or likelihood of something happening, similar to having just a one percent chance. Full definition
Women who carry the gene have about an 85 per cent chance of developing the disease. (newscientist.com)
The 450 ppm level is considered to be the point at which the world has a 50 per cent chance of avoiding dangerous climate change. (climatecrocks.com)
The average 65 year old will live to age 84 and there is a 40 per cent chance for married couples of that age that one spouse will survive into their»90s. (rbc.com)