Vampires are ABO Positive!
Blood donors are rare...and some are more rare than others, figuratively and literally. World statistics suggest the following breakdown for blood types:
Question #1: Do these statistics fit "your world"? That is, gather data from your people you know, etc.
- O Positive: 37.4%
- O Negative: 6.6%
- A Positive: 35.7%
- A Negative: 6.3%
- B Positive: 8.5%
- B Negative: 1.5%
- AB Positive: 3.4%
- AB Negative: 0.6%
Question #2: Do these statistics fit "the world"? That is, gather data from the Internet, local blood banks, etc.
Question #3: Do these statistics fit "each" different nationality? If not, how does this affect the proposed statistics?
Question #4: Do these statistics change over time, as note that the statistics provided are from 1981?
Source: K. Hledik's "How Rare Are You?" Oregon Mathematics Teacher, Feb. 1981, p. 28.