# Statistics Probability Test (Retake)

19 Questions | Total Attempts: 121  Settings  This is a test over the concepts in the Probability Unit.

• 1.
True or False:  The probability of an event occurring is 1 minus the probability that it doesn’t occur orP(A) = 1- P(not A).
• A.

True

• B.

False

• 2.
True or False:Two events are disjoint (mutually exclusive) if they share exactly two outcomes in common.
• A.

True

• B.

False

• 3.
True or False:If A and B are independent events, then the probability of A or B is P(A∩B) = P(A)•P(B).
• A.

True

• B.

False

• 4.
You draw a card at random from a standard deck of 52 cards.  Find the probability of drawing two aces in a row, without replacement.
• A.

0.0045

• B.

0.1538

• C.

0.0059

• D.

0.9955

• 5.
The American Red Cross says that about 45% of the U.S. population has Type O blood, 40% type A, 11% Type B, and the rest Type AB.   Someone volunteers to give blood.  What is the probability that this donor has Type AB blood?
• A.

.4

• B.

.04

• C.

.96

• D.

1

• 6.
The American Red Cross says that about 45% of the U.S. population has Type O blood, 40% type A, 11% Type B, and the rest Type AB.  Someone volunteers to give blood.  What is the probability that this donor has Type A or Type B?
• A.

.51

• B.

.49

• C.

.044

• D.

.04

• 7.
The American Red Cross says that about 45% of the U.S. population has Type O blood, 40% type A, 11% Type B, and the rest Type AB.  Among four potential donors, what is the probability that all are Type O?
• A.

.09

• B.

.55

• C.

1.8

• D.

.04

• 8.
The American Red Cross says that about 45% of the U.S. population has Type O blood, 40% type A, 11% Type B, and the rest Type AB.  Among four potential donors, what is the probability that at least one person is Type B?
• A.

.11

• B.

.37

• C.

.63

• D.

.89

• 9.
A certain bowler can bowl a strike 70% of the time.  What is the probability that she bowls a perfect game (12 consecutive strikes)?
• A.

.01

• B.

8.4

• C.

0

• D.

.3

• 10.
You bought a new set of four tires from a manufacturer who just announced a recall because 2% of those tires are defective.  What is the probability that at least one of yours is defective?
• A.

.59

• B.

.92

• C.

.41

• D.

.08

• 11.
A probability experiment consists of picking one marble from a box that contains a red, a yellow, and a blue marble, and then flipping a coin once. Identify the sample space. (Let R = red, Y = yellow, B = blue, H = head, and T = tail.)
• A.

RY, RB, YB, YR, BR, BY, HT, TH, HH, TT

• B.

RR, YY, BB, HH, TT

• C.

RH, RT, YH, YT, BH, BT

• D.

R, Y, B, H, T

• 12.
A random sample of 250 students is taken and classified by type of school and reading ability. What is the probability of randomly picking a student with average reading ability, given the student attends a private school?
• A.

0.534

• B.

0.188

• C.

0.376

• D.

0.352

• 13.
Two cards are randomly selected, without replacement, from a standard deck of playing cards. What is the probability of first picking a five and then picking a card other than a five?
• A.

0.505

• B.

0.004

• C.

0.072

• D.

0.071

• 14.
The table shows the number of traffic violations by day of occurrence and type of offense for a particular city. Use the table to find the indicated probabilities.A traffic violation is randomly selected. What is the probability that it is a speeding violation?
• A.

0.718

• B.

0.257

• C.

0.190

• D.

0.265

• 15.
The table shows the number of traffic violations by day of occurrence and type of offense for a particular city. Use the table to find the indicated probabilities.A traffic violation is randomly selected. What is the probability that it is a speeding violation given that the violation occurred on a weekend?
• A.

0.282

• B.

0.448

• C.

0.075

• D.

0.290

• 16.
True or False:The two events can be proven independent if P(B|A) = P(A).
• A.

True

• B.

False

• 17.
A check of dorm room son a large college campus revealed that 38% had refrigerators, 52% had TVs, and 21% had both a TV and a refrigerator.  What's the probability that a randomly selected dorm room has neither a TV nor a refrigerator?
• A.

0.79

• B.

0.2976

• C.

0.10

• D.

0.90

• 18.
If a fair coin is flipped twice with the outcome of each flip independent of each other, what is the probability that two consecutive flips is heads?
• A.

0.25

• B.

0.5

• C.

0.75

• D.

1

• 19.
Which of the following would simulate 60% ?
• A.

Randint(0,9); let 0,1,2 represent "success"

• B.

Randint(0,9); let even numbers be a "success"

• C.

Randint(0,9); let 0,1,2,3,4,5 represent a "success"

• D.

Randint(0,9); let getting a 6 represent a "success"

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