To form a __________ we form a ratio between each frequency and the total number of scores in the set.
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A. stem-and-leaf display |
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B. frequency distribution |
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C. relative frequency distribution |
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D. frequency polygon |
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Question 2 of 20
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5.0 Points |
Please use the following to answer questions 2-3:
| Class Scores |
Frequency (f) |
| (lower limit < value < upper limit) |
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| 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?
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A. 0.30 |
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B. 0.18 |
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C. 0.225 |
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D. 9 |
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Question 3 of 20
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Question 4 of 20
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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?
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A. 20.7 |
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B. 25.9 |
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C. 27 |
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D. 29 |
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Question 5 of 20
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Question 6 of 20
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Question 7 of 20
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What is the mode of the data?
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A. 25 |
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B. 25 |
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C. There is no mode for the data set. |
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D. The data set is bimodal, with modes of 25 and 27. |
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Question 8 of 20
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5.0 Points |
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?
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A. 37 |
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B. 37.32 |
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C. 37.78 |
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D. 38.83 |
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Question 9 of 20
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5.0 Points |
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?
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A. 425 |
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B. 200 |
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C. 340 |
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D. 725 |
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Question 10 of 20
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For questions 10-13, use the following data:
13 29 41 60 89 14 26 53 7 14
What is the arithmetic mean of the data?
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A. 20 |
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B. 14 |
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C. 34.6 |
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D. 82 |
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Question 11 of 20
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Question 12 of 20
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Question 13 of 20
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Question 14 of 20
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Question 15 of 20
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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?
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A. 0.08 |
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B. 0.12 |
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C. 0.18 |
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D. 0.20 |
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Question 16 of 20
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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?
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Question 17 of 20
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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?
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A. 0.286 |
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B. 0.40 |
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C. 0.60 |
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D. 0.67 |
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Question 18 of 20
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5.0 Points |
Please answer questions 18-19 using the following information:
| Class Scores |
Frequency – f |
| Lower limit < score < upper limit |
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| 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?
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A. 0.25 |
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B. 0.30 |
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C. 0.40 |
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D. 0.65 |
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Question 19 of 20
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What is the probability that a selected observation is greater than 39, but less than 60?
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A. 0.20 |
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B. 0.40 |
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C. 0.30 |
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D. 0.50 |
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Question 20 of 20
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5.0 Points |
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
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A. Range = 15; Variance = 225; Standard Deviation = 7.5 |
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B. Range = 3.85; Variance = 14; Standard Deviation = 3.74 |
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C. Range = 20; Variance = 15; Standard Deviation = 4 |
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D. Range = 15; Variance = 14.82; Standard Deviation = 3.85 |
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