mike bayville business analysis

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

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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

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

	A. 12%
	B. 24%
	C. 30%
	D. 84%

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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?

	A. 20.7
	B. 25.9
	C. 27
	D. 29

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What is the trimmed mean of the data?

	A. 22.875
	B. 26.625
	C. 31.525
	D. 34.375

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What is the median of the data?

	A. 26
	B. 26.5
	C. 27
	D. There is no median for this data set.

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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.

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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

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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

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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?

	A. 20
	B. 14
	C. 34.6
	D. 82

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What is the range of the data?

	A. 14
	B. 34.6
	C. 82
	D. 50

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What is the variance of the data?

	A. 231.04
	B. 616.64
	C. 685.16
	D. 1,197.16

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What is the standard deviation of the data?

	A. 0.2
	B. 26.18
	C. 24.83
	D. 34.61

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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.

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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?

	A. 0.08
	B. 0.12
	C. 0.18
	D. 0.20

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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?

	A. 2
	B. 5
	C. 6
	D. 10

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