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Statistics Chapter 12. 1. Sampling and Frequency Distributions Section 12.1. 2. Procedure for Making a Frequency Distribution. 3. Example.
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Example How many hours per week do you spend reading? According to NOP World Co., Americans read an average of 5.7 hours per week. The following data represent the number of hours of reading per week for 20 people:4 3 4 0 4 3 6 3 1 66 5 2 7 5 5 6 2 2 7 4
Example a. Make a frequency distribution of the number of hours spent reading per person. b. What is the most frequent number of hours spent reading per person? c. How many people read more hours than the average? What percent is that? d. How many people read fewer hours than the average? What percent is that? 5
Solution 6
Example • The following are the minimum weekly salaries (rounded to the nearest hundred dollars) for persons engaged in film production:$7800 $5200 $4600 $1900 $1800 $1600 $1500 $1400 $800 $700 $700 $600 • Make a frequency distribution using four classes. • Make a histogram and a frequency polygon. 7
Solution 8
Example Do you think you are getting old? As of this writing, the following were the authenticated ages of the 25 oldest people: 121 115 115 114 113 113 113 113 112 112 112 112 112 111 111 111 111 111 111 110 110 110 110 110 109 Find the class width using five classes. 9
Solution 10 END
