1. Frequency Tables and Histograms Unit 8 – M1F

2. Warm – Up!!  Good Morning! As you walk in, please pick up your calculator and begin working on the warm-up! Use the two way table to help you! 1.How many total people own a car? 2.What is the relative frequency of people that have a sports car and are female to the number of people that have a sports car? Round to the nearest tenth if necessary. 3.What is the relative frequency of people that have a sports car and are male to the number of people that have a sports car? Round to the nearest tenth if necessary.

3. Frequency Tables The frequency of an interval is the number of data values in that interval. A frequency table groups a set of data values into intervals and shows the frequency for each interval. Intervals do not overlap  There cannot be gaps  Usually of equal size

4. Example 1: 1. What is the interval size? 2. Which class marks occur the most? 3. Which class marks occur the least? 4. What percentage of class marks occur within the 36-40 range?

5. Example 2: 1-2 3-4 5-6 7-8 9-10 Fill in the frequency table. The marks awarded for an assignment set for a class of 20 students were as follows. 67577876 7 10688956 4 8 4 9

6. You Try!! 125-130 131-135 136-140 141-145 146-150 Create a frequency table given the following data: Wing spans (cm): 126139144125149 133140142149150 127130 150

7. Histograms A histogram is a graph that can display data from a frequency table. Example 3: The data below are the number of hours per week a group of students spent watching television. What is a histogram that represents the data? HoursFrequency 0-56 6-115 12-173 18-231

8. Histogram vs. Bar Graph -Bars should touch -Bars should never touch -x axis is intervals- x axis is categories -y axis is always the frequency -y axis is the amount in each category -Bars can show trends

9. Example 4: 80-85 86-90 91-95 96-100 101-105 The finishing times, in seconds, for a race are shown below. What is a histogram that represents the data? 95105838093 98102 998289 908289

10. You Try!!  Make a histogram of the following data:

11. Begin Working on your Practice! Any questions?!