1 point for determining numerator in conditional probability formula
1 point for determining denominator in conditional probability formula
1 point for calculating probability
–½ if answer not rounded correctly

This result is the probability of a _____.
(Circle the correct choice below.)

Points earned on this question:
Available points on this question:
8

b.
Given that a person tests negative, what is the probability that the person has
the disease?
State your answer as a decimal rounded to
4 decimal places
.
.0823
1 point for choosing correct probability below
.0018
1 point for choosing correct probability below

MthSc 101
Test 3
Spring 2013
Essential Mathematics
Version
A
KEY
Sections 5C – 7B
5.
When two fair dice are rolled, 36 equally likely outcomes are possible as shown
below.
1 1
2 1
3 1
4 1
5 1
1 2
2 2
3 2
4 2
5 2
1 3
2 3
3 3
4 3
5 3
1 4
2 4
3 4
4 4
5 4
1 5
2 5
3 5
4 5
5 5
1 6
2 6
3 6
4 6
5 6
Directions:
State all probabilities as
reduced fractions
a.
Let the random variable
X
be the product of the two numbers that appear when
two fair dice are rolled. Complete the probability distribution.
6 1
6 2
6 3
6 4
6 5
6 6
.

Version
A
KEY
– Page
15
of
16
Points earned on this question:
Available points on this question:
14

b.
Find the following probabilities.

MthSc 101
Test 3
Spring 2013
Essential Mathematics
Version
A
KEY
Sections 5C – 7B
Version
A
KEY
– Page
16
of
16
Scantron
(1 pt.)
Check to make sure your Scantron form meets the following criteria. If any of the
items are NOT satisfied when your Scantron is handed in and/or when your
Scantron is processed one point will be subtracted from your test total.
My Scantron:
uni25A1
is bubbled with firm marks so that the form can be machine read;
uni25A1
is not damaged and has no stray marks (the form can be machine read);
uni25A1
has
15
bubbled in answers;
uni25A1
has
MthSc 101
and my Section number written at the top;
uni25A1
has my Instructor’s name written at the top;
uni25A1
has Test No.
3
written at the top;
uni25A1
has Test Version
A
both written at the top and bubbled in below my CUID;
uni25A1
and shows my correct CUID both written and bubbled in.