5E Fall 2010
Homework 1 Solutions
Chapter 3:
11.
Using the mean we get
x
city
=15.58,
highway
x
= 18.92
For the samples we see that the mean highway mileage is better than the mean city mileage.
City
13.2
14.4
15.2
15.3
15.3
15.3
15.9
16
16.1
16.2
16.2
16.7
16.8
Median
Mode: 15.3
Highway
17.2
17.4
18.3
18.5
18.6
18.6
18.7
19.0
19.2
19.4
19.4
20.6
21.1
Median
Mode: 18.6, 19.4
The median and modal mileages are also better for highway driving.
19. a.
Range = 60  28 = 32
IQR =
Q
3

Q
1
= 55  45 = 10
b.
x
435
9
48 33
.
2
(
)
742
i
x
x
2
2
(
)
742
92.75
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