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Back to 3.3 Two Basic Rules of Probability

3.3 Exercise 39

Avg difficulty 2.5

According to the American Red Cross, a person with type O blood and a negative Rh factor (Rh-) can donate blood to any person with any blood type. Their data show that 45% of people have type O blood and 7% of people have Rh- factor; 38% of people have type O or Rh- factor.

  1. Find the probability that a person has both type O blood and the Rh- factor.
  2. Find the probability that a person does NOT have both type O blood and the Rh- factor.

OpenStax Introductory Statistics 2e, 3.3 Two Basic Rules of Probability, exercise 39

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Adapted from Introductory Statistics 2e © 2023 Rice University. Licensed under CC BY 4.0. Source: Introductory Statistics 2e. Imported at revision 50ec917.