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what is the probability that at least 3 never respond?

what is the probability that at least 3 never respond?

A First Course in Probability (10th Edition)
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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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)
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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