0. mputer Secu omputer U.S. businesses. CSI sends survey questionnaires to computer security personnel at all U.S. corporations and government agencies. The 2010 CSI survey was sent and 351 organizations responded. One of the survey questions asked respondents to indicate the percentage of monetary losses attributable to malicious actions by individuals within the organization (i.e., malicious insider actions). The following table summarizes the data for the 144 firms who experienced some monetary loss due to malicious insider actions. Lower Bound 0 10 20 30 40 50 60 70 80 90 Sum Upper Bound 10 20 30 40 50 60 70 80 90 100 Cell Midpoint 5 15 25 35 45 55 65 75 85 95 Frequency 43 55 16 3 2 1 9 4 5 6 144 a. Find the mean percentage loss for the sample of firms who reported some loss. b. Find the median, upper and lower quartiles. c. Draw the box plot. d. Would you describe this distribution as symmetric or skewed? Justify. e. Compute the variance and the standard deviation of the monetary percentage losses.
0. mputer Secu omputer U.S. businesses. CSI sends survey questionnaires to computer security personnel at all U.S. corporations and government agencies. The 2010 CSI survey was sent and 351 organizations responded. One of the survey questions asked respondents to indicate the percentage of monetary losses attributable to malicious actions by individuals within the organization (i.e., malicious insider actions). The following table summarizes the data for the 144 firms who experienced some monetary loss due to malicious insider actions. Lower Bound 0 10 20 30 40 50 60 70 80 90 Sum Upper Bound 10 20 30 40 50 60 70 80 90 100 Cell Midpoint 5 15 25 35 45 55 65 75 85 95 Frequency 43 55 16 3 2 1 9 4 5 6 144 a. Find the mean percentage loss for the sample of firms who reported some loss. b. Find the median, upper and lower quartiles. c. Draw the box plot. d. Would you describe this distribution as symmetric or skewed? Justify. e. Compute the variance and the standard deviation of the monetary percentage losses.
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Author:Amos Gilat
Publisher:Amos Gilat
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
Transcribed Image Text:6. The Computer Security Institute (CSI) conducts an annual survey of computer crime at
U.S. businesses. CSI sends survey questionnaires to computer security personnel at all
U.S. corporations and government agencies. The 2010 CSI survey was sent and 351
organizations responded. One of the survey questions asked respondents to indicate the
percentage of monetary losses attributable to malicious actions by individuals within the
organization (i.e., malicious insider actions). The following table summarizes the data for
the 144 firms who experienced some monetary loss due to malicious insider actions.
Lower
Bound
0
10
20
30
40
50
60
70
80
90
Sum
Upper
Bound
10
20
30
40
50
60
70
80
90
100
Cell
Midpoint
5
15
25
35
45
55
65
75
85
95
Frequency
43
55
16
3
2
1
9
4
5
6
144
a. Find the mean percentage loss for the sample of firms who reported some loss.
b. Find the median, upper and lower quartiles.
c. Draw the box plot.
d. Would you describe this distribution as symmetric or skewed? Justify.
e. Compute the variance and the standard deviation of the monetary percentage losses.
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