© 2010 Pearson Prentice Hall. All rights reserved. Example 1: Constructing a Frequency Distribution A questionnaire was given to a graduating class of a university. One question was, “What was your major?” The student responses are shown in the frequency distribution. Graduating Class of a University responses to “What was your major?” MajorFrequency Biology23 Chemistry14 Communications36 Criminal Justice22 Education45 English20 Engineering54 History35 Nursing50 Physics18 1

© 2010 Pearson Prentice Hall. All rights reserved. Example 2: Constructing a Frequency Distribution Construct a frequency distribution for the data of the age of maximum yearly growth for 35 boys: 12, 14, 13, 14, 16, 14, 14, 17, 13, 10, 13, 18, 12, 15, 14, 15, 15, 14, 14, 13, 15, 16, 15, 12, 13, 16, 11, 15, 12, 13, 12, 11, 13, 14, 14. 2

© 2010 Pearson Prentice Hall. All rights reserved. Example 3: Interpreting a Grouped Frequency Distribution A random sample of recent college graduates was polled entering the workforce. The frequency distribution shows the salary distribution of the new graduates. Salary of Recent College Graduates SalaryFrequency $0-$9,0000 $10,000-$19,0001 $20,000-$29,0006 $30,000-$39,00015 $40,000-$49,00024 $50,000-$59,00031 $60,000-$69,00012 $70,000-$79,0005 $80,000-$89,0003 $90,000-$99,0002 $100,000 or more1 3

© 2010 Pearson Prentice Hall. All rights reserved. Example 3 continued 1. What is the most common salary range? 2. What is the class width? 3. What is the lower class limit for each class? 4. What is the upper class limit for each class? 5. How many students participated in the poll? 6. How many students make at least $40,000? 7. How many students make at most $69,000? 4