1. Bar Graphs & Histograms PS 15-1 Construct and interpret histograms Do Now: Copy the PS, Do now, and title for notes Find the mean, median, mode, and range of the data: State# Pets per household State# Pets per household Nebraska3New York1 Wyoming5Idaho2 California1Texas3 Planner: Bar Graphs & Histograms HW: P. 22-23 # 4, 8, 12, 13

2. Vocabulary Bar Graph- a graph that uses vertical or horizontal bars to display data Double Bar Graph- a bar graph that compares two related sets of data Histogram – a bar graph that shows the frequency of data within equal intervals

3. What’s the difference?

4. Interpreting bar graphs What color of M&M’s was the most popular? What color was the least? About how many more orange M&M’s were there than blue M&M’s?

5. Making a histogram 1. Make a frequency table of the data – Make sure you use equal intervals 2. Choose an appropriate scale and interval for the vertical axis. – The greatest value on the scale should be at least as great as the greatest frequency 3. Draw a bar for each interval – The height of the bar is the frequency for that interval – Bars must touch, but not overlap 4. Label the axes and give the graph a title

6. Let’s try together Make a histogram of the data: 26, 16, 13, 19, 21, 14, 12, 20, 15, 17, 27, 22 1.Make a frequency table Make the histogram IntervalFrequency 10-14 15-19 20-24 25-29 Intervals Frequency

7. Homework P. 22-23 # 4, 8, 12, 13