SNG statistics

[Hakon]

Maybe I've misunderstood something, but I used a 95% confidence interval to calculate that: http://en.wikipedia.org/wiki/Confidence_interval

<p - z sqrt(p(1-p)/n), p + z sqrt(p(1-p)/n)> = <.19 - 1.96 sqrt(.19(1-.19)/150), .19 + 1.96 sqrt(.19(1-.19)/150)> = <.13, .25>

Don't you think he's got any idea wether he's a winning player when he's played 150 SnGs with a ROI of 19%?