Prob Stat Chapter 5 Practice

The two-way table gives summarizes information about seniors and juniors at a high school and the way they typically get to school.

Randomly select one student. What is the probability that he or she is a senior or walks to school?

• 40/250

• 40/88

• 40/550

• 338/550

The two-way table gives summarizes information about seniors and juniors at a high school and the way they typically get to school.

Randomly select one student. What is the probability that he or she is a senior, given that he or she walks to school?

• 40/250

• 40/88

• 40/550

• 88/250

The two-way table gives summarizes information about seniors and juniors at a high school and the way they typically get to school.

Randomly select one student. Which one of the following is true about the events “Is a senior” and “walks to school”?

• These two events are mutually exclusive and independent.

• These two events are neither mutually exclusive nor independent.

• These two events are mutually exclusive, but we do not have enough information to determine if they are independent.

• These two events are mutually exclusive, but not independent.

When a polling organization randomly calls households for a survey, there is a 0.10 probability they are able to obtain a response. If the organization randomly calls 10 households, what is the probability they are able to obtain a response from at least 1 household?

• 0.0000

• 0.3487

• 0.5000

• 0.6513

The partially-complete table below shows the distribution of favorite sport to watch on TV for a sample of students.

If a randomly chosen student’s favorite sport involves a ball, what is the probability the student’s favorite choice is football?

• 0.45

• 0.36

• 0.50

• 0.63

On an airplane, 92% of people are in economy seats (also known as coach). Of the people in economy, 48% are members of the airline’s frequent flier club. If event E is being in an economy seat and event F is being a member of the airline’s frequent flier club, which of the following is true?

• P(F | E) = 0.48

• P(E | F) = 0.48

• P(E n F) = 0.48

• P(F | E) = 0.92

• P(E | F) = 0.92

Suppose that a random sample of 500 cell phone users was selected and asked their age and type of cell phone. If cell phone type is independent of age, what is the value of x?

• 50

• 83

• 100

• 110

When Ann drives to school, she only passes one intersection with a stop light. Based on her previous experience, there is a 0.70 probability that the light is green or yellow (she always goes on yellow!) and the outcomes on consecutive days are independent. If she drives to school 5 days, what is the probability that the light is red on all 5 day

• 0.832

• 0.168

• 0.002

• 0.998

Suppose that a student is randomly selected. The probability that the student is a senior is 0.22. The probability that the student has a driver’s license is 0.30. If the probability that the student is a senior and has a driver’s license is 0.16, what’s the probability that the student isn’t a senior and doesn’t have a driver’s license?

• 0.06

• 0.14

• 0.64

• 0.70

In a class, there are 20 girls and 16 boys. If the teacher selects two students at random to attend a party with the principal, what is the probability that the two students are both boys?

• 0.302

• 0.190

• 0.198

• 0.250