Quiz 2 STA2023

What proportion of the students are female and less than 6 years old? Age Gender 5 years old 6 years old 7 years old Totals Male 2 9 1 12 Female 2 6 0 8 Totals 4 15 1 20

2/20

The probability that a tutor will see 0, 1, 2, 3, or 4 students over the course of one hour is: x 0-1-2-3-4 P(x)4/27-1/27-5/9-?-5/27

2/27

A card is drawn from a standard deck of 52 playing cards. Find the probability that the card is an ace or a black card.

7/13

If the computed probability of an event occurring is 0.01. Which of the following statements is correct?

We would expect the event to occur about one percent of the time

The following table categorizes the students in a first-grade class by age and gender. Age Gender 5 years old 6 years old 7 years old Totals Male 2 9 1 12 Female 2 6 0 8 Totals 4 15 1 20 What proportion of the students are female or less than 6 years old?

10/20

A survey of senior citizens at a doctor's office shows that 52% take blood pressure-lowering medication, 43% take cholesterol-lowering medication, and 5% take both medications. What is the probability that a senior citizen takes either blood pressure-lowering or cholesterol-lowering medication?

0.90

If the probability of an event is 1, the event is impossible.

False

It has been estimated that 40% of marriages end in divorce. If you randomly select 9 recently married couples what is the probability that at least one of the marriages will end in divorce?

0.9899

A multiple-choice test has five questions with each question having five answer choices. Only one of the choices is correct. You randomly guess the answer to each question. What is the probability that you answer the first two questions correctly?

0.04

Statistics show that about 42% of Americans voted in the previous national election. If three Americans are randomly selected, what is the probability that none of them voted in the last election?

0.20

A report from the Secretary of Health and Human Services stated that 70% of single-vehicle traffic fatalities that occur at night on weekends involve an intoxicated driver. If a random sample of 15 single-vehicle traffic fatalities that occur at night on a weekend is selected, find the probability that 11 involve a driver who is intoxicated.

0.22

Applicants for a job first submit a written application. Based on the written applications, 40% of the applicants are invited for a first interview. Of those that have a first interview, 58% are rejected after the interview. What is the probability that a randomly selected applicant receives a first interview and is rejected after the interview?

0.232

Empirical evidence suggests that 25% of Florida drivers are uninsured. If four random Florida drivers are involved in an accident, what is the probability that more than one of them are uninsured?

0.26

A survey revealed that 31% of people are entertained by reading books, 39% are entertained by watching TV, and 30% are entertained by both books and TV. What is the probability that a person will be entertained by either books or TV?

0.40

The distribution of Master's degrees conferred by a university is listed in the table.(assume that a student majors in only one subject) Major: Mathematics English Engineering Business Education Frequency: 230 206 86 176 222 What is the probability that a randomly selected student with a Master's degree majored in English or Mathematics? Round your answer to three decimal places.

0.474

The probability of an individual having Type O blood is 0.45. What is the probability of having a blood type other than O?

0.55

What is the set of all possible outcomes of a probability experiment?

Sample space

An event A will occur with probability 0.4. An event B will occur with probability 0.6. The probability that both A and B will occur is 0.20. We may conclude

That events A and B are dependent.

The Multiplication Rule says that P(A and B) = P(A) × P(B). What must be true about events A and B for this rule to apply?

The events must be independent.

Two events are dependent if when one occurs:

The probability of the other occurring is changed.

Two events are independent if when one occurs:

The probability of the other occurring is unchanged.

A probability cannot be negative or greater than 1.

True

The temperature in degrees Fahrenheit on July 4th in Juneau, Alaska.

continuous

The number of phone calls to the attendance office of a high school on any given school day.

discrete

If a person is selected at random, decide if the events A and B are mutually exclusive or not mutually exclusive. A: Their birthday is in the fall. B: Their birthday is in October.

not mutually exclusive