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
Andrea (1)	ahn-DRE-ah	Italian
Mihkel	-	Estonian
Divya	-	Indian, Hindi, Marathi, Kannada, Tamil, Telugu, Malayalam
Catrina	-	Irish, Scottish
Mickey	['miki]
NÓIrÍN	-	Irish