Multiple Choice


  1. Question 1

    4 PointsA(n) __________ variable is one in which values are determined by chance.Blank 1


  2. Question 2

    4 PointsThe following distribution is not a probability distribution because X21012P(X)0.160.20–0.120.450.31


  3. Question 3

    4 PointsA(n) __________ probability distribution consists of the finite number of values a random variable can assume and the corresponding probabilities of the values.Blank 1


  4. Question 4

    4 PointsThe sum of the probabilities of all the events in the sample space of a probability distribution must equal 1.


  5. Question 5

    4 PointsDiscrete variables have values that can be measured.


  6. Question 6

    4 PointsThe following distribution is not a probability distribution because X21012P(X)0.080.210.430.170.26


  7. Question 7

    4 PointsContinuous random variables are obtained from data that can be measured rather than counted.


  8. Question 8

    4 PointsFind the mean of the distribution shown.X46P(X)0.360.64


  9. Question 9

    4 PointsFind the mean of the distribution shown.X12P(X)0.320.68


  10. Question 10

    4 PointsThe number of cartoons watched on Saturday mornings by students in Mrs. Kelly’s first grade class is shown below. Number of cartoons watched X012345Probability P(X)0.150.200.300.100.200.05
    What is the mean of the data?


  11. Question 11

    4 PointsGive the variance of the following distribution? X01234P(X)0.200.350.100.250.10


  12. Question 12

    4 PointsFind the mean of the distribution shown below. X234P(X)0.350.240.41


  13. Question 13

    4 PointsWhat is the standard deviation of the following probability distribution? X02468P(X)0.200.050.350.250.15


  14. Question 14

    4 PointsA pet supplier has a stock of parakeets of which 20% are blue parakeets. A pet store orders 3 parakeets from this supplier. If the supplier selects the parakeets at random, what is the chance that the pet store gets exactly one blue parakeet?


  15. Question 15

    4 PointsA coin is tossed five times. Find the probability of getting exactly three heads.


  16. Question 16

    4 PointsThe probability of a success remains the same for each trial in a binomial experiment.


  17. Question 17

    4 PointsA coin is tossed 72 times. Find the standard deviation for the number of heads that will be tossed.


  18. Question 18

    4 PointsA surgical technique is performed on twelve patients. You are told there is 70% chance of success. Find the probability that the surgery is successful for exactly 9 patients.


  19. Question 19

    4 PointsA surgical technique is performed on nine patients. You are told there is 70% chance of success. Find the probability that the surgery is successful for exactly 5 patients.


  20. Question 20

    4 PointsA surgical technique is performed on ten patients. You are told there is 85% chance of success. Find the probability that the surgery is successful for at least 8 patients


  21. Question 21

    4 PointsA surgical technique is performed on seven patients. You are told there is 70% chance of success. Find the probability that the surgery is successful for at least 5 patients


  22. Question 22

    4 PointsIf a student randomly guesses at 15 multiple-choice questions, find the probability that the student gets exactly seven correct. Each question has four possible choices.


  23. Question 23

    4 PointsIf a student randomly guesses at 10 multiple-choice questions, find the probability that the student gets exactly five correct. Each question has four possible choices.


  24. Question 24

    4 PointsFind the mean and the standard deviation of a Binomial Distribution with n= 124 and p= 0.26


  25. Question 25

    4 PointsFind the mean and the standard deviation of a Binomial Distribution with n= 316 and p= 0.72


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