1.4 million straightforward individualists

You're a rugged individualist, who's straightforward and likes to do things your own way. Creative and flexible, you adapt easily to any situation. But your insistence on being independent can sometimes go too far and become a weakness. 
The above was the analysis of the people from my blood group, B+, via a (good old) chain mail. Me being me, wanted to crank out some numbers.
Number of blood groups: 8
World Population projection at the time of writing this post(via US Census Bureau): 6,811,631,214
Raw number of people in each blood group: 6,811,631,214 / 8 = 851,453,902
Now, that's not accurate though, as not every blood group has the same number of people, so lets take a look at what Wikipedia (I trust Wikipedia) has to say about the distribution:

 

O+ 36.44% A+ 28.27% B+ 20.59% AB+ 5.06% O- 4.33% A- 3.52% B- 1.39% AB- 0.45%

Lets take my blood group: B+
Number of people sharing the blood group: 0.2059 * 6,811,631,214 = 1,402,514,867 
There's about a 1.4 million other people who, according to the "analysis" are individualists, straightforward, creative, flexible, etc. etc. What are the chances its true?
On another note, this analysis seems to be fairly positive, even the last part, where the weakness is the "insistence on independence". Why wouldn't one accept the analysis as true even if it isn't?
The same argument can also be applied to your daily horoscopes, where the numbers are a little easier as the distribution of births is fairly uniform throughout the year.