find the mean of the data summarized in the given frequency distribution. Also, compare the computed means to the actual means
obtained by using the original list of data values, which are as follows:
(Exercise a)
21.1 mg;
(Exercise b)
76.3 beats per minute;
(Exercise c)
46.7 mi/h;
(Exercise d)
1.911 lb.
Exercise a :
Tar (mg) in
Non-filtered
Cigarettes
Frequency
10–13
1
14–17
0
18–21
15
22–25
7
26–29
2
Exercise b:
Pulse Rates
of Females
60–69
12
70–79
14
80–89
11
90–99
100–109
110–119
120–129
Exercise c:
Speeding TicketsThe given frequency distribution describes the speeds of drivers ticketed by the Town of Poughkeepsie police. These drivers were traveling through a 30mi/h speed zone on Creek Road, which passes the author’s college. How does the mean speed compare to the posted speed limit of 30mi/h?
Speed
42–45
25
46–49
50–53
54–57
3
58–61
Exercise d:
Weights (lb)
of Discarded
Plastic
0.00–0.99
1.00–1.99
20
2.00–2.99
21
3.00–3.99
4
4.00–4.99
5.00–5.99
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