Frequency Tables and Histograms Unit 8 – M1F

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.

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

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 range?

Example 2: Fill in the frequency table. The marks awarded for an assignment set for a class of 20 students were as follows

You Try!! Create a frequency table given the following data: Wing spans (cm):

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

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

Example 4: The finishing times, in seconds, for a race are shown below. What is a histogram that represents the data?

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

Begin Working on your Practice! Any questions?!