CHAPTER 3
CHAPTER 3
Name:_chris wells_________________
MATH1530WWW ______ out of 10
1. 150 college students had their blood typed. Complete the table below to determine the
probability associated with each type.
Blood Type
O+
A+
B+
AB+
O-
A-
B-
AB -
TOTAL
COUNT
58
47
13
4
13
10
3
2
150
.087
.027
.087
.067
.02
.013
PROBABILITY 0.387 .313
a. Based on your table, what is the probability that a randomly selected student with blood
type AB+?
.027
b. What is the probability that a randomly selected student does not have blood type O+?
.613
b. What is the probability that a randomly selected student either has blood type O+ or A-?
.454
d. What is the probability that a randomly selected student has blood type OA?
0, there is no blood type called OA
2. Using the table from problem #1:
a. If two students are randomly selected from the survey without replacement, find the
probability that both have blood type AB+?
.000537
b. If two students are randomly selected from the survey without replacement, find the
probability that the first is A- and the second is O+?
.026
c. If two students are randomly selected from the survey with replacement, find the
probability that both type AB+?
.000711
d. If two students are randomly selected from the survey with replacement, find the
probability that the first is A- and the second is O+?
.0258
CHAPTER 3
3. Complete the following table and find the probabilities.
Republican
5
Democrat
16
TOTAL
21
MALE
47
32
79
TOTAL
52
48
100
FEMALE
For parts a-e, assume that one person is selected at random.
a. P(male) .79
b. P(Democrat).48
c. P( male or Republican) .84
d. P( female and Democrat) .16
e. P( male and Republican) .47
f. If two are randomly selected without replacement, find the probability that they both
are female Republicans. P(female Republican and female Republican)
.002
g. If two are randomly selected without replacement, find the probability that they both
are male and Democrat. P( male Democrat and male Democrat)
.1
h. P(Democrat | female)
.762
i. P( female| Democrat)
.333
CHAPTER 3
This lab evaluates student understanding of the following student
learning outcomes from the master syllabus of this course:
1. Solve basic probability problems.
2. Apply the addition and multiplication rules.
3. Define and use the rules of complementary events.