Endgames
Statistical question
Probability and prevalence
BMJ 2009; 338 doi: https://doi.org/10.1136/bmj.b539 (Published 12 February 2009) Cite this as: BMJ 2009;338:b539
- John Fletcher, clinical epidemiologist
- 1BMJ, London WC1H 9JR
- jfletcher{at}bmj.com
If the prevalence of blood group O negative is 9%, what is the probability that among four randomly chosen unrelated people none will be O negative?
a) 36%
b) 64%
c) 66%
d) …
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