Answered: (a) What is the probability that a…

Calculus For The Life Sciences

2nd Edition

ISBN:9780321964038

Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.

Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.

Chapter12: Probability

Section12.2: Introduction To Probability

Problem 99E

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Question

Human blood is classified by the presence or absence of three main antigens (A, B, and Rh). When a blood specimen is typed, the presence of the A and/or B antigen is indicated by listing the letter A and/or the letter B. If neither the A nor the B antigen is present, the letter O is used.

The following table gives the percent of a country's population having each of the eight possible blood types in the sample space. Note that the presence or absence of the Rh antigen is indicated by the symbols + or −, respectively.

Blood Types	A⁺	A⁻	B⁺	B⁻	AB⁺	AB⁻	O⁺	O⁻
Percent	35.9	6.3	9.5	2.5	3.2	0.8	37.4	4.4

(a) What is the probability that a person selected at random from the population has a blood type that is type A given that the person is Rh⁻? (Round your answer to two decimal places.)

(b) What is the probability that a person selected at random from the population has a blood type that is Rh⁺ given that the person is type B? (Round your answer to two decimal places.)

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