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MATH230
Spring 2006
Exam 1a
Name:________________________________
Section:___________
Instructions:
1. Do not start until instructed to do so.
2. You may use a calculator and one 3x5 card (front and back) with notes,
but nothing else.
3. SHOW ALL WORK to receive full credit.
4. Circle your answers.
5. Report answers that are probabilities to 4 decimal places.
6. The work you turn in must be your own.
1
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6 points
The route used by a certain motorist in commuting to work contains two intersections with
traffic signals.
The probability that he must stop at the first signal is .4, the probability that he must
stop at the second signal is .5, and the probability that he must stop at at least one of the two signals
is .6.
What is the probability that he must stop at both signals?
Questions 2 – 4
:
Let
{
}
5
,
4
,
3
,
1
=
A
and
{
}
2
,
1
,
0
=
B
be subsets of
{
}
5
,
4
,
3
,
2
,
1
,
0
=
U
.
2.
3 points
List the elements of
B
A
∪
.
3.
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 Spring '08
 CRISSINGER
 Math

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