question, 1 through 20

1 of 20

To form a __________ we form a ratio between each frequency and the total number of scores in the set.

A. stem-and-leaf display

B. frequency distribution

C. relative frequency distribution

D. frequency polygon Reset Selection


2 of 2
Please use the following to answer questions 2-3:
Class Scores Frequency (f)
(lower limit < value < upper limit)
0-20 6
20-40 9
40-60 15
60-80 12
80-100 8
What is the relative frequency of the 20–40 class?


A. 0.30

B. 0.18

C. 0.225

D. 9 Reset Selection


3 of 20
What is the percent frequency of the 60-80 class?

A. 12%

B. 24%

C. 30%

D. 84% Reset Selection


4 of 20

For Questions 4-7, use the following data:
The number of file conversions performed by a processor per day for 10 days was:

15, 27, 25, 28, 30, 31, 22, 25, 27, 29

What is the arithmetic mean of the data?


A. 20.7

B. 25.9

C. 27

D. 29 Reset Selection


5 of 20

What is the trimmed mean of the data?

A. 22.875

B. 26.625

C. 31.525

D. 34.375 Reset Selection


6 of 20

What is the median of the data?

A. 26

B. 26.5

C. 27

D. There is no median for this data set. Reset Selection

7 of

What is the mode of the data?

A. 25

B. 25

C. There is no mode for the data set.

D. The data set is bimodal, with modes of 25 and 27. Reset Selection


8 of 20

Sample data on employee age for a large auto parts manufacturer are as follows:
Employee Age Frequency
25-29 25
30-34 33
35-39 62
40-44 26
45-49 31
50-54 8
What is the mean age of the employees?


A. 37

B. 37.32

C. 37.78

D. 38.83 Reset Selection


9 of 20

A survey of the number of television sets per household in a city yielded the following results:
Number of TV Sets Number of Households
1 400
2 800
3 400
4 100
What is the trimmed mean of the number of televisions per household?


A. 425

B. 200

C. 340

D. 725 Reset Selection


10 of 20

For questions 10-13, use the following data:
13 29 41 60 89 14 26 53 7 1

What is the arithmetic mean of the data?


A. 20

B. 14

C. 34.6

D. 82 Reset Selection


11 of 20

What is the range of the data?

A. 14

B. 34.6

C. 82

D. 50 Reset Selection


12 of 20

What is the variance of the data?

A. 231.04

B. 616.64

C. 685.16

D. 1,197.16 Reset Selection


13 of 20

What is the standard deviation of the data?

A. 0.2

B. 26.18

C. 24.83

D. 34.61 Reset Selection

14 of 20

A probability is always expressed as a value from:

A. 0 and 1.

B. -1 and 1.

C. 0 and 100.

D. 0 and 10. Reset Selection


15 of 20

Records at a high school indicate that each year for the past five years, 120 of the 1,500 students were absent on the first day of hunting season. What is the likelihood that a particular student will be absent on the first day of hunting season this year?

A. 0.08

B. 0.12

C. 0.18

D. 0.20 Reset Selection


16 of 20

A study of a manufacturing process indicates that 120 of 6,000 units produced are defective. If a sampler selected 100 units, how many defective units would he expect to be present?

A. 2

B. 5

C. 6

D. 10 Reset Selection


17 of 20

Six red balls and four blue balls are placed in a container. What is the probability that the first ball drawn from the container is blue?

A. 0.286

B. 0.40

C. 0.60

D. 0.67 Reset Selection


18 of

Please answer questions 18-19 using the following information:
Class Scores Frequency - f
Lower limit < score < upper limit
20-30 6
30-40 10
40-50 12
50-60 8
60-70 4
What is the probability that a selected observation is between 40 and 50?


A. 0.25

B. 0.30

C. 0.40

D. 0.65 Reset Selection

19 of 20

What is the probability that a selected observation is greater than 39, but less than 60?

A. 0.20

B. 0.40

C. 0.30

D. 0.50 Reset Selection


20 of 20

Calculate the range, variance, and standard deviation of the following data set:
5, 5, 6, 6, 6, 8, 8, 8, 8, 10, 10, 11, 12, 12, 20


A. Range = 15; Variance = 225; Standard Deviation = 7.5

B. Range = 3.85; Variance = 14; Standard Deviation = 3.74

C. Range = 20; Variance = 15; Standar