No, 5%.

It'd be 4% if it were "four times as likely".

I suspect "as" and "more" frequently get lost in translation.

It does seem so:

From http://thehustle.co/your-ceo-is-probably-a-psychopath

> FACT: 4% of CEOs are psychopaths

> About 1% of the human population are psychopaths. But CEOs are four times more likely to be psychopaths than the average person, according to journalist Jon Ronson. He spent two years researching this, and published a book titled “The Psychopath Test: A Journey Through the Madness Industry.”

So the cited article suffers from the same ambiguity. I wonder what Jon Ronson actually wrote. Google was not helpful :(

Yeah... I'm not sure 4% counts as "probably" either. I would not be surprised to discover other inaccuracies.

The book was not well received by mental health professionals ;)

Yes.

No 400%.