what is the probability that at least 3 never respond?
College Algebra (MindTap Course List)
12th Edition
ISBN:9781305652231
Author:R. David Gustafson, Jeff Hughes
Publisher:R. David Gustafson, Jeff Hughes
Chapter8: Sequences, Series, And Probability
Section8.7: Probability
Problem 33E: Find the probability of each event. Drawing 5 orange cubes from a bowl containing 5 orange cubes and...
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Question
Transcribed Image Text:When sent a questionnaire, 50% of the recipients respond immediately. Of those who do
not respond immediately, 60% respond when sent a follow-up letter. If the questionnaire
is sent to 4 persons and a follow-up letter is sent to any of the 4 who do not respond
immediately, what is the probability that at least 3 never respond?
A
D
E
(0.2) 4 + 4.(0.2) ³. (0.8)
(0.2)4 + 4.(0.2).(0.8)³
(0.4) 4 + 4C (0.4) ³. (0.6)
(0.9)4 + 4.(0.9) ³. (0.1)
4.(0.2) ³ (0.8)
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