Its reckoned 95% of traders lose money. (The figures 80%,90%,99% are also sometimes quoted).
Of the 5% that make money, its reckoned that that the majority are right between 35%-50% of the
time (ie between 35-50% of their trades are profitable).
However some succesfull traders claim they have a win rate of between 60-75%.
Some losing traders even claim to make money 90% of the time, but lose so much 10% of the time
that they end up being net losers.