MATH 221 Week 2 Quiz 2

MATH 221 Week 2 Quiz 2 | Devry University

Week 2: Quiz

Question 1

 (CO 2) A random number generator is used to select a number from 1 to 100. What is the probability of selecting an odd number?  

·         0.077 

·         0.050  

·         0.500  

·         0.250

 

Question 2

 (CO 2) What is the sample space to responses to a question whose answers are Up, Down, Left, or Right along with a question on preference between Blue and Red?  

·         (Up, Down, Left, Right, Blue, Red)    

·         (Up, Blue)(Up, Red)(Down, Blue)(Down, Red)(Left, Blue)(Left, Red)(Right, Blue)(Right, Red)  

·         (Up, Up)(Down, Down)(Left, Left)(Right, Right)(Blue, Blue)(Red, Red)  

·         (Up, Blue)(Up, Blue)(Down, Blue)(Down, Blue)(Left, Blue)(Left, Blue)(Right, Blue)(Right, Blue)

 

Question 3

 (CO 2) Consider the table below

Response (number of cats owned)          Frequency

None     659

One       329

Two       52

Three    13

Four or more     8

 

What is the probability that the next person asked has four or more cats?  

·         A little more than 1%  

·         31%  

·         Less than 1%

·         5%

 Question 4

 (CO 2) Consider the table below

Age Group          Frequency

18-29     9831

30-39     7845

40-49     6869

50-59     6323

60-69     5410

70 and over        5279

What is the probability that the next person chosen will be in the 30-39 or 40-49 age groups?  

·         35.4%  

·         23.7%  

·         18.9%  

·         31.7%

 

 Question 5

 (CO 2) According to company records, the probability that a dishwasher will need repairs during its first six years is 0.09. This is an example of which type of probability?  

·         Public probability  

·         Classical probability  

·         Subjective probability    

·         Empirical probability

 

 Question 6

 (CO 2) Consider the table below.

Age Group          Frequency

18-29     9831

30-39     7845

40-49     6869

50-59     6323

60-69     5410

70 and over        5279

 

What is the complement of P(40-59), or P(40-59’)?  

·         71.8%  

·         64.6%    

·         68.3%  

·         31.7%

 

 Question 7

 (CO 2) You are selling your product at a three-day event. Each day, there is a 60% chance that you will make money. What is the probability that you will make money on the first day and lose money on the next two days?  

·         0.288  

·         0.144    

·         0.096  

·         0.216

 

Question 8

 (CO 2) Consider the table below.

                Profit     Loss       Total

Urban location  50           38           88

Rural location     61           94           155

Total      111         132         243

 

Find the probability that a randomly selected location is going to be profitable, given that it is in an urban location.  

·         56.8%  

·         51.4%  

·         48.8%  

·         36.2%

 

 

Question 9

 (CO 3) Consider the table below.

 Production location        Correct Defective            Total

East        258         31           289

West     572         106         678

North    755         94           849

South    491         74           565

Total      2076       305         2381

 

 

Find the probability that a randomly selected product is from the North, given that it is correct.  

·         88.9%  

·         87.2 %  

·         12.1%    

·         36.4%

 

Question 10

 (CO 2) Classify these events. Selecting a king from a deck of cards, replacing it and selecting a queen from the same deck. These events would be considered:  

·         Independent  

·         Dependent  

·         Subjective  

·         Empirical

 

 Question 11

 (CO 2) Classify these events. Some businesses paint the outside of their buildings red while some businesses offer employees health benefits. These events would be considered:  

·         Subjective 

·         Classical

·         Independent   

·         Dependent

 

 Question 12

 (CO 2) In a survey of 320 customers, 58 say that service is poor. You select two customers without replacement to get more information on their satisfaction. What is the probability that both say service is poor?  

·         3.29%  

·         3.20%    

·         3.24%  

·         3.19%

 

Question 13

 (CO 2) Randomly select a customer that takes the bus to our store. Randomly select a customer that is a teenager. Are these events mutually exclusive?  

·         Non-mutually exclusive events  

·         Mutually exclusive events

 

 Question 14

 (CO 2) Two cards are selected without replacement from a standard deck of 52 cards.  Find the probability of selecting a 4 and then selecting a 5.  

·         0.0769  

·         0.0044  

·         0.0059    

·         0.0060

 

 Question 15

 (CO 2) Two cards are selected with replacement from a standard deck of 52 cards.  Find the probability of selecting a jack and then selecting a queen.  

·         0.0769  

·         0.00440  

·         0.0060  

·         0.0059

 

Question 16

 (CO 2) The probability of a golden retriever catching a tennis ball in mid-air is 88%.  Find the probability that a golden retriever catches three tennis balls in mid-air.  

·         0.6584  

·         0.7744    

·         0.6815  

·         0.5314

 

 Question 17

 (CO 2) A statistics class has 50 students and among those students, 42 are business majors and 8 like grilled cheese.  Of the business majors, 3 like grilled cheese.  Find the probability that a randomly selected statistics student is a business major or likes grilled cheese.  

·         0.84    

·         0.94  

·         0.96  

·         0.19

 

 Question 18

 (CO 2) An event is successful 1 out of every 5 attempts.  What is the probability of the complement of that event?  

·         0.20    

·         0.80  

·         0.15