1-Astudent's course grade is based on one midterm that counts as 10% of his finalgrade, one class project that counts as 10% of his finalgrade, a set of homework assignments that counts as

50% of his finalgrade, and a final exam that counts as 30% of his final grade. His midterm score is 73, his project score is 83, his homework score is 78, and his final exam score is 73. What is his overall finalscore? What letter grade did he earn(A, B, C, D, orF)? Assume that a mean of 90 or above is anA, a mean of at least 80 but less than 90 is aB, and so on.

a)His overall final score is___________

(Type an integer or a decimal rounded to one decimal

place asneeded.)

b)His letter grade is________

2- In a data set with a range of 55.4 to 105.4 and 400observations, there are 276 observations with values less than 86. Find the percentile for 86.

A.P122.56

B.P612

C.P69

D.P32

3- If the standard deviation for a set of data is0, which of the following must betrue?

A. All the data values equal 0.

B. All of the data values are negative.

C. All of the data values are identical.

D. None of the above must be true since the standard deviation cannot be equal to 0.

4- In onetown, 66% of adults have health insurance. What is the probability that 4 adults selected at random from the town all have healthinsurance? Round to the nearest thousandth if necessary.

A.0.66

B.0.061

C.2.64

D.0.19

5- Listed below are pulse rates(beats perminute) from samples of adult males and females. Find the mean and median for each of the two samples and then compare the two sets of results. Does there appear to be adifference?

Male:

64 88 53 91 93 54 52 70 58 83 63 62 61 97 79

Female:

73 69 86 93 74 70 95 88 89 75 82 95 79 71 6

Find the means.

The mean for males is

beats per minute and the mean for females is

beats per minute.

(Type integers or decimals rounded to one decimal place asneeded.)

Find the medians.

The median for males is

beats per minute and the median for females is

beats per minute.

(Type integers or decimals rounded to one decimal place asneeded.)

Compare the results. Choose the correct answer below.

A.The mean and the median for males are both lower than the mean and the median for females.

B.The mean and median appear to be roughly the same for both genders.

C.The median is lower formales, but the mean is lower for females.

D.The mean and the median for females are both lower than the mean and the median for males.

E.The mean is lower formales, but the median is lower for females.

Does there appear to be adifference?

A.There does not appear to be any difference.

B.Since the sample size issmall, no meaningful information can be gained from analyzing the data.

C.The pulse rates for females appear to be higher than the pulse rates for males.

D.The pulse rates for males appear to be higher than the pulse rates for females.

6- Which measure of variation is most sensitive to extremevalues?

Choose the correct answer below.

Mean

Median

Histogram

Range

7- Find the standard deviation for the given sample data. Round your answer to one more decimal place than the original data.

18 18 18 9 15 5 10 5 15

A.5.8

B.5.4

C.1.6

D.5.1

8- Use the data in the followingtable, which listsdrive-thru order accuracy at popular fast food chains. Assume that orders are randomly selected from those included in the table.

Drive-thru Restaurant

A

B

C

D

Order Accurate

315

272

246

135

Order Not Accurate

39

59

38

13

If one order isselected, find the probability of getting an order that is not accurate.

The probability of getting an order that is not accurate is ________ .

(Round to three decimal places asneeded.)

9- Winning the jackpot in a particular lottery requires that you select the correct three numbers between 1 and 26 and, in a separatedrawing, you must also select the correct single number between 1 and 43. Find the probability of winning the jackpot.

The probability of winning the jackpot is

nothing

(Type an integer or simplifiedfraction.)

10 - When randomly selectingadults, let M denote the event of randomly selecting a male and let B denote the event of randomly selecting someone with blue eyes. What does P(M|B) represent? Is P(M|B) the same as P(B|M)?

What does P(M|B) represent?

A.

The probability of getting a male or getting someone with blue eyes.

B.

The probability of getting amale, given that someone with blue eyes has been selected.

C.

The probability of getting someone with blueeyes, given that a male has been selected.

D.

The probability of getting a male and getting someone with blue eyes.

Is P(M|B) the same as P(B|M)?

A.

No, because P(B|M) represents the probability of getting someone with blueeyes, given that a male has been selected.

B.

Yes, because P(B|M) represents the probability of getting someone with blueeyes, given that a male has been selected.

C.

No, because P(B|M) represents the probability of getting amale, given that someone with blue eyes has been selected.

D.

Yes, because P(B|M) represents the probability of getting amale, given that someone with blue eyes has been selected.

11- Which of the following is NOT a property of the standarddeviation?

Choose the correct answer below.

A.

The standard deviation is a measure of variation of all data values from the mean.

B.

The value of the standard deviation is never negative.

C.

When comparing variation in samples with very differentmeans, it is good practice to compare the two sample standard deviations.

D.

The units of the standard deviation are the same as the units of the original data.

12-In a small privateschool, 6 students are randomly selected from 15 available students. What is the probability that they are the six youngeststudents?

The probability is

(Type an integer or a simplifiedfraction.)

13- Refer to the sample data forpre-employment drug screening shown below. If one of the subjects is randomlyselected, what is the probability that the test result is a falsepositive? Who would suffer from a false positiveresult? Why?

Pre-Employment Drug Screening ResultsPositive test result

Negative test result

Drug Use Is Indicated

Drug Use Is Not Indicated

Subject Uses Drugs

43 14

Subject Is Not a Drug User

2 30

The probability of a false positive test result is

(Round to three decimal places asneeded.)

Who would suffer from a false positiveresult? Why?

A.The employer would suffer because the person tested would be suspected of using drugs when in reality he or she does not use drugs.

B.The person tested would suffer because he or she would not be suspected of using drugs when in reality he or she does use drugs.

C. The person tested would suffer because he or she would be suspected of using drugs when in reality he or she does not use drugs.

D. The employer would suffer because the person tested would not be suspected of using drugs when in reality he or she does use drugs.

14- How will a high outlier in a data set affect the mean andmedian?

A.

distribution skewed to theleft, mean pulled to theleft, median not effected

B.

distribution skewed to theright, mean pulled to theright, median not effected

C.

distribution skewed to theright, mean noteffected, median skewed to the right

D.

distribution skewed to theright, mean noteffected, median not effected

15- Complete the following statement.

P(AorB) indicates_______.

Choose the correct answer below.

A.

the probability that A and B both occur in the same trial.

B.

the probability that event A or event B does not occur in a single trial.

C.

the probability that event A occurs in one trial followed by event B in another trial.

D.

the probability that in a singletrial, event Aoccurs, event Boccurs, or they both occur.

18-A magazine published a list consisting of the state tax on each gallon of gas. If we add the 50 state tax amounts and then divide by50, we get 27.3 cents. Is the value of 27.3 cents the mean amount of state sales tax paid by all U.S.drivers? Why or whynot?

Choose the correct answer below.

A.

Yes, the value of 27.3 cents is the mean because it is a measure of center and all measures of centers can be refered to as either an average or a mean.

B.

No, the value of 27.3 cents is not the mean because it is the median that is found by summing all sample values and then dividing the by total number of values.

C.

Yes, the value of 27.3 cents is the mean because a mean is found by summing all sample values and then dividing the by total number of values.

D.

No, the value of 27.3 cents is not the mean because the 50 amounts are all weighted equally in thecalculation, but some states consume more gas thanothers, so the mean amount of state sales tax should be calculated using a weighted mean.

19-Lastyear, nine employees of an electronics company retired. Their ages(in years) at retirement are listed below. Find themode(s) for the given sample data.

51 61 62 57 50 67 68 58 53

A.

51yr, 61yr, 62yr, 57yr, 50yr, 67yr, 68yr, 58yr, 53 yr

B.

58.6 yr

C.

58 yr

D.

There is no mode.

20- A successful basketball player has a height of 6 feet 11 inches, or 211 cm. Based on statistics from a dataset, his height converts to the z score of 5.17. How many standard deviations is his height above themean?

21- Find the indicated complement.

A certain group of women has a 0.25% rate ofred/green color blindness. If a woman is randomlyselected, what is the probability that she does not havered/green colorblindness?

What is the probability that the woman selected does not havered/green colorblindness? (Type an integer or a decimal. Do notround.)

22- The following table contains data from a study of two airlines which fly to SmallTown, USA. If one flight isselected, find P(on time and UpstateAirlines).

Number of flights which were on time

Number of flights which were late

Podunk Airlines

33

6

Upstate Airlines

43

5

A.

4376

B.

1176

C.

4387

D.

None of the above

23- Human body temperatures have a mean of 98.20F and a standard deviation of 0.62F. Sally's temperature can be described by z=1.5. What is hertemperature? Round your answer to the nearest hundredth.

A.

97.27F

B.

95.79F

C.

96.70F

D.

99.13F

24- The customer service department of a phone company is experimenting with two different systems. On Monday they try the first system which is based on an automated menu system. On Tuesday they try the second system in which each caller is immediately connected with a live agent. A quality control manager selects a sample of seven calls each day. He records the time for each customer to have his or her question answered. The times(in minutes) are listed below. Find the coefficient of variation for each of the two sets ofdata, then compare the variation. Round results to one decimal place.

AutomatedMenu:5.5 7.4 3.9 2.9 9.2 6.3 11.7

Liveagent:6.2 2.9 4.4 4.1 3.4 5.2 3.7

A.

AutomatedMenu: 25.2%

Liveagent: 41.5%

There is substantially more variation in the times for the live agent.

B.

AutomatedMenu: 47.1%

Liveagent: 27.3%

There is substantially more variation in the times for the automated menu system.

C.

AutomatedMenu: 48.8%

Liveagent: 28.3%

There is substantially more variation in the times for the automated menu system.

D.

AutomatedMenu: 45.4%

Liveagent: 26.3%

There is substantially more variation in the times for the automated menu system.