Sample Exercise Problems
Questions 1 through 4 refer to the following data for the weight of trucks crossing a small
bridge on Highway 377 during one day to be used to look at stress on the bridge.
The truck
weights and frequencies are shown in the following table.
Truck weights (000 #)
Frequency
28 and < 32
12
32 and < 36
22
36 and < 40
28
40 and < 44
20
44 and < 48
18
1. The cumulative frequency of the 3
rd
class is:
A.
3
B.
28
C.
62
D.
76
2. The relative frequency for the 3
rd
class is _______________.
3.
The
cumulative
relative frequency for the 2nd class is ___________.
4. What percentage of the trucks noted in the table above, had weights 36,000# or greater?
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Use the following sample values to answer questions #1 through #6:
5, 9, 8, 7, 11, 6
1.
What is the sample mean?
1.
A. 4.67
B. 6.00
C. 7.50
D. 7.67
2.
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 Fall '11
 Pavur
 Standard Deviation, Sample Exercise Problems

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