Statistics Probability Test (Retake)

19 Questions | Total Attempts: 93

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Statistics Probability Test (Retake)

This is a test over the concepts in the Probability Unit.


Questions and Answers
  • 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. 
    • 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"