Endgames Statistical question

Probability and prevalence

BMJ 2009; 338 doi: http://dx.doi.org/10.1136/bmj.b539 (Published 12 February 2009) Cite this as: BMJ 2009;338:b539
  1. John Fletcher, clinical epidemiologist
  1. 1BMJ, London WC1H 9JR
  1. 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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