2-79. A batch of 25 injection-molded parts contains 5 that have suffered excessive shrinkage. (a) If two parts are selected at random, and without replace- ment, what is the probability that the second part selected is one with excessive shrinkage? (b) If three parts are selected at random, and without replace- ment, what is the probability that the third part selected is one with excessive shrinkage?

A First Course in Probability (10th Edition)
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Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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2-79. A batch of 25 injection-molded parts contains 5 that
have suffered excessive shrinkage.
(a) If two parts are selected at random, and without replace-
ment, what is the probability that the second part selected
is one with excessive shrinkage?
(b) If three parts are selected at random, and without replace-
ment, what is the probability that the third part selected is
one with excessive shrinkage?
2-80. A lot of 100 semiconductor chips contains 20 that are
defective.
(a) Two are selected, at random, without replacement, from
the lot. Determine the probability that the second chip se-
lected is defective.
(b) Three are selected, at random, without replacement,
from the lot. Determine the probability that all are
defective.
Transcribed Image Text:2-79. A batch of 25 injection-molded parts contains 5 that have suffered excessive shrinkage. (a) If two parts are selected at random, and without replace- ment, what is the probability that the second part selected is one with excessive shrinkage? (b) If three parts are selected at random, and without replace- ment, what is the probability that the third part selected is one with excessive shrinkage? 2-80. A lot of 100 semiconductor chips contains 20 that are defective. (a) Two are selected, at random, without replacement, from the lot. Determine the probability that the second chip se- lected is defective. (b) Three are selected, at random, without replacement, from the lot. Determine the probability that all are defective.
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