An advertisement seeking volunteers for a clinical research draws 11 respondents. Of these respondents, 5 are below

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An advertisement seeking volunteers for a clinical research draws 11 respondents. Of these respondents, 5 are below age 30 and 6 are over 30. The researcher will randomly select 4 persons to assign to a particular treatment regimen.
(a) How many selections are possible?
(b) What is the probability exactly 3 of the selected persons are below age 30?
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Statistics Principles And Methods

ISBN: 9780470904114

7th Edition

Authors: Richard A. Johnson, Gouri K. Bhattacharyya

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