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quiz_10b.docx-Question 1 2 out of 2

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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