MAT 2377
Midterm
23 February, 2010
Professor: R. Kulik
Time: 80 minutes
Student Number:
Family Name:
First Name:
This is an open book examination.
Only nonprogrammable and nongraphic calculators are permitted.
Record your answer to each question in the table below.
Number of pages:
3
(including this one).
NOTE: At the end of the examination, hand in only this page. You may keep the questionnaire.
Question
Answer
1
2
3
4
5
6
7
8
9
10
1
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Q
1.
A company’s warranty document states that the probability that a new swimming pool requires some repairs
within the ﬁrst year is 20%. What is the probability, that the sixth sold pool is the ﬁrst one which requires
some repairs within the ﬁrst year?
(a)
0.6068
(b)
0.3932
(c)
0.9345
(d)
0.0655
(e)
none of the preceding
Q
2.
Let
X
denote a number of failures of a particular machine within a month. Its probability mass function is
given by
x
0
1
2
3
4
5
P
(
X
=
x
)
0.17
0.23
0.19
0.13
0.08
0.2
Compute the probability that there are more than 3 failures within a month.
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 Spring '10
 AzizK
 Probability, Probability theory, preceding

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