Spring Final Exam Review

If P(A) = 0.5, P(B) = 0.6, P(A and B) = 0.1, what is P(A|B)?

• 1/2

• 3/10

• 1/5

• 1/6

If P(A) = 0.30, P(A or B) = 0.40, and P(A and B) = 0.10, what is P(B)?

• 0.2

• 0.6

• 0.5

• 0.4

• 0.33

• 0.284

• 0.311

• 0.579

• 0.612

In a certain town, 50% of the households own a cellular phone, 40% own a pager, and 20% own both a cellular phone and a pager. The proportion of households that own neither a cellular phone nor a pager is:

• 90%

• 0%

• 70%

• 30%

• 10%

Insurance company records indicate that 12% of all teenage drivers have been ticketed for speeding and 9% for going through a red light. If 4% have been ticketed for both, what is the probability that a teenage driver has been issued a ticket for speeding but not for running a red light?

• 3%

• 8%

• 12%

• 13%

• 17%

Steven has a box of LED's containing 2 blue ones, 3 white ones, 7 red ones, and 3 green ones. If two LED's are drawn at random from the box without replacement, what is the probability that both LED's are not red?

• 4/15

• 56/225

• 23/30

• 64/224

• 11/15

Which one of these variables is a continuous random variable?

• the time it takes a randomly selected student to complete an exam.

• the number of tattoos a randomly selected person has.

• the number of women taller than 68 inches in a random sample of 5 women.

• the number of correct guesses on a multiple choice test.

The mean number of customers that make a purchase during the first hour that the store is open is:

• 2.0

• 4.0

• 2.9

• 3.0

• 2.5

The standard deviation of the number of customers that make a purchase during the first hour that the store is open is:

• 1.4

• 4.0

• 3.0

• 0.2

• 2.0

According to a CBS/New York Times poll, 15% of the public have responded to a telephone call-in poll. In a random group of five people, what is the probability that exactly two have responded to a call-in poll?

• 0.138

• 0.165

• 0.300

• 0.835

• 0.973