Question

There are seven photocopiers, and three of these photocopiers are defective. The buyer begins to test them one at a time to figure out which three are defective.

a. What is the probability that the first defective photocopier is found on the fifth test?

b. What is the probability that the second defective photocopier is found on the fifth test?

c. What is the probability that the third defective photocopier is found on the fifth test?

d. What is the probability that no more than five tests are needed to find the three defective photocopiers?

e. Given that exactly one of the defective photocopiers was found within the first three tests, what is the probability that the other two defective photocopiers are found within the next three tests?

f. Given that exactly two of the defective photocopiers were found within the first three tests, what is the probability the last defective photocopier is found within the next two tests?

g. Given that exactly two of the defective photocopiers were found within the tests 1, 3, 5, what is the probability the other defective photocopier was found on tests 6 or 7?

h. Given the last defective photocopier was found within the last two tests, what is the probability that the first two defective photocopiers were found within the first three tests?

Answer #1

There are seven photocopiers, and three of these photocopiers
are defective. The buyer begins to test them one at a time to
figure out which three are defective.
a. What is the probability that the first defective photocopier
is found on the fifth test?
b. What is the probability that the second defective photocopier
is found on the fifth test?
c. What is the probability that the third defective photocopier
is found on the fifth test?
d. What is the...

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One of the large photocopiers used by a printing company has a
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of its design and the frequency of usage, it occasionally breaks
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Probability
0
0.12
1
0.32
2
0.24
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Baseball's World Series is a maximum of seven games, with the
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One of the large photocopiers used by a printing company has a
number of special functions unique to that particular model. This
photocopier generally performs well but, because of the complexity
of its design and the frequency of usage, it occasionally breaks
down. The department has kept records of the number of breakdowns
per month over the last fifty months. The data is summarized in the
table below:
Number of Breakdowns
Probability
0
0.12
1
0.32
2
0.24
3...

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