a fifty-fifty chance

if there is a fifty-fifty chance of something happening, it is equally likely to happen or not to happen (usually + of + doing sth) I'd say he's got a fifty-fifty chance of winning the race.

Common Names:

Name	Pronounced	Usage
Arnt	-	Norwegian
Stella (2)	-	Greek
ThorbjØRn	-	Norwegian
Jadvyga	-	Lithuanian
Narantsetseg	-	Mongolian
Ninian	-	Scottish, Irish, Ancient Celtic