PARKING TICKETS
According to data from the city of Toronto,Ontario, Canada, there were more
than
200,000 parking infractions in the city
for December 2011, with fines totaling over
9.000.000 Canadian dollars.
The fines (in Canadian dollars) for a random
sample of 100 parking infractions in Toronto,
Ontario, Canada, for December 2011 are listedbelow.
Source
City of Te
30 30 60 40 3040
15
90
3060 60 30 60 30
30
30 60) 30 60 60
30 30 40 105 60
30 30 30 15 30
3030
4030
3
4060
30 30 60
100 30
4030
6030
40 40
330 30 30 30
15 30
30
40
30 60 30
4030 40 40
6030
3030
30 30 60 30 30
30
3030
30
30
30
15
60
30
30
30
40
40
30
30
30
40
30
100
30
40
60
40
60
40
30
30
3030
30
Parking Infractions by Time of Day
2:00PM
9.4%
12:00 AM3:39 AM
12:00 PM3:39 PM26.19
4:00 AM159 AM64%
1:00AM11:59 AM
4:00 PM7:59 PM17.30
Parking Infractions by Day
10,000
4.0002,000
Day
The figures above show parking infractions inToronto, Ontario, Canada, for December 2011by time of day and by day.
Questions:
1. Make a frequency distribution for the data. Use a class width of 15.2. Draw a histogram for the data. Does the distribution appear to be bell-shaped?3. What percent of the distribution lies within one standard deviation of the mean? Within
two standard deviations of the mean? Within three standard deviations of the mean?
4. Use the frequency distribution to estimate the sample mean and sample standard
deviation of the data. Do the formulas for grouped data give results that are as accurateas the individual entry formulas? Explain.
5. Do you think the mean or the median better represents the data? Explain your reasoning.