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quiz 10b.docx-Question 1 2 out of 2
quiz_10b.docx-Question 1 2 out of 2
Page 1
Question 1
2 out of 2 points
Government data show that 8% of the American population are at least 75 years of age
and that about 54% of Americans are women. Also, 11% of women are at least 75 years
of age. What is the probability that a male is
under 75 years of age?
Selected
Answer:
0.9
6
Correct
Answer:
0.9
6
Response
Feedback:
This is correct. Text reference: Section 10.5
Bayes' Rule
Question 2
2 out of 2 points
Here are the counts of trees in a forestry plot, classified by species and the diameter of
the tree.
What is the probability that a randomly chosen
hemlock tree has a large
diameter?
Selected
Answer:
0.4
2
Correct
Answer:
0.4
2
Response
Feedback:
This is correct. Text reference: Section 10.2
Conditional Probability
Question 3
2 out of 2 points
In a small town, 60% of the households have a pet dog. If a household has a pet dog,
there is a 70% chance that the household also owns a cat. If a household does not have a
dog, there is a 30% chance that the household owns a cat. What is the probability that a
randomly selected household does not own a cat?
Selected
Answer:
0.4
6
Correct
Answer:
0.4
6
Response
Feedback:
This is correct. Text reference: Section 10.3 General
Probability Rules
Question 4
Page 2
2 out of 2 points
Suppose that about 35% of students in school have used marijuana in the last year. In
order to preserve anonymity during surveys, a technique called randomized response is
often used. A student is approached and asked to flip a coin but not show it to the
interviewer. If the coin is heads, the student answers the question: "Was your mother
born in January to June (inclusive)?" If the coin is tails, the student answers the question:
"Have you used marijuana in the last year?" Because the interviewer does not know the
outcome of the coin flip, the students' responses are confidential. What is the probability
then that if a yes is received, the student used marijuana in the last year?
Selected
Answer:
0.4
1
Correct
Answer:
0.4
1
Response
Feedback:
This is correct. Text reference: Section 10.4
Tree Diagrams
Question 5
2 out of 2 points
People with type O-negative blood are universal donors. That is, any patient can receive
a transfusion of O-negative blood. Only 12.4% of the American population have O-
negative blood. If
8 people appear at random to give blood, what is the probability that at
least one of them is a universal donor?
Selected
Answer:
0.6
5
Correct
Answer:
0.6
5
Response
Feedback:
This is correct. Text reference: Section 10.3
GeneralProbability Rules
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