To quote Mark Twain, "There are lies, damn lies, and statistics".
To demonstrate that numbers can be manipulated to support any claim, the best example I recall is: "I can put 50 men and 50 women in a room and argue, quite logically according to the math, that the average person in that room has one breast and one testicle."
If I remember correctly, the author conceded he'd be hard-pressed to find anyone fitting that description.