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A batch of 25 injection-molded parts contains 5parts that
Chapter 2, Problem 129E(choose chapter or problem)
A batch of 25 injection-molded parts contains 5 parts that have suffered excessive shrinkage.
(a) If two parts are selected at random, and without replacement, what is the probability that the second part selected is one with excessive shrinkage?
(b) If three parts are selected at random, and without replacement, what is the probability that the third part selected is one with excessive shrinkage?
Questions & Answers
QUESTION:
A batch of 25 injection-molded parts contains 5 parts that have suffered excessive shrinkage.
(a) If two parts are selected at random, and without replacement, what is the probability that the second part selected is one with excessive shrinkage?
(b) If three parts are selected at random, and without replacement, what is the probability that the third part selected is one with excessive shrinkage?
ANSWER:
Step 1 of 3
Given a random experiment for a batch of 25 injection-molded parts which contain 5 parts that have suffered excessive shrinkage.
Let A and B be the two events.
A is first part selected has excessive shrinkage and
B is second part has excessive shrinkage.
Our goal is we need to find the probability that
a) The second part selected is one with excessive shrinkage.
b) The third part selected is one with excessive shrinkage.