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CHAPTER 1
INTRODUCTION AND DESCRIPTIVE STATISTICS
114.
First, order the data:
1.2, 3.9, 8.3, 9, 9.5, 10, 11, 11.6, 12.5, 13, 14.8, 15.5, 16.2, 16.7, 18
The median, or 50th percentile, is the point in position 16(50/100) = 8. The point is 11.6.
First quartile is in position 16(25/100) = 4.
Point is 9.
Third quartile is in position 16(75/100) = 12.
Point is 15.5.
55th percentile is in position 16(55/100) = 8.8.
Point is 12.32.
85th percentile is in position 16(85/100) = 13.6.
Point is 16.5.
116.
Order the data: 1, 1, 1, 2, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7.
Lower quartile is the 25th percentile, in position 16(25/100) = 4.
Point is 2.
The median is in position 16(50/100) = 8.
The point is 3.
Upper quartile is in position 16(75/100) = 12.
Point is 5.
IQR = 5  2 = 3.
60th percentile is in position 16(60/100) = 9.6.
Point is 4.
120.
For the data of Problem
114
:
Mean = 11.2533
Median = 11.6
Mode:
none
124.
For the data of Example
11
:
Mean = 163,260
Median = 166,800
Mode:
none
126.
Mean = 29.0
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This note was uploaded on 11/24/2010 for the course MATH BAOI taught by Professor Phong during the Spring '10 term at Wash. College.
 Spring '10
 Phong
 Statistics

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