2.122 In the field of quality control, the science of statistics is often used to determine if a process is "out of control." Suppose the process is, indeed, out of con- trol and 20% of items produced are defective. (a) If three items arrive off the process line in succes- sion, what is the probability that all three are de- fective? (b) If four items arrive in succession, what is the prob- ability that three are defective?
2.122 In the field of quality control, the science of statistics is often used to determine if a process is "out of control." Suppose the process is, indeed, out of con- trol and 20% of items produced are defective. (a) If three items arrive off the process line in succes- sion, what is the probability that all three are de- fective? (b) If four items arrive in succession, what is the prob- ability that three are defective?
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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
Transcribed Image Text:2.122 In the field of quality control, the science of
statistics is often used to determine if a process is "out
of control." Suppose the process is, indeed, out of con-
trol and 20% of items produced are defective.
(a) If three items arrive off the process line in succes-
sion, what is the probability that all three are de-
fective?
(b) If four items arrive in succession, what is the prob-
ability that three are defective?
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