# MATH

• WELCOME TO MATH!

Today we will compare data using the graphs we have worked with over the past weeks. You can flip back through Chapter 7 in your textbook (or access the websites from previous days) to review bar graphs, line graphs, line plots, and pictographs.

Here we go! :)
Suppose you conduct a survey with the question "What is your favorite pizza topping?"
You will survey both the students in Room 206 and the students in Room 205. (Each classroom contains 18 students.)
Do you suppose the results will be exactly the same for both surveys?
Hmmm ...
The surveys are unlikely to get identical responses because different groups of students are being surveyed.

Please open your book to page 240. You will find surveys performed by Leo and Jan. They asked students in different classes how they come to school. The data they collected from the surveys is displayed in their bar graphs.

►How can you compare the results of Jan's and Leo's surveys?
A: You can compare the heights of corresponding bars in the two
graphs. (In other words, compare the bar for 'Car' in Leo's data to
the bar for 'Car' in Jan's data.)

NOTICE THAT SOME OF THE BARS FALL BETWEEN TWO LINES.
Look at Leo's data and locate the bar which falls between two lines.
The line above is 8 and the line below is 6.
What would be the value for the height of the bar which stops between 6 and 8?
A: 7

Let's do a few of the problems on p. 240 together.
1. Which way of coming to school did most students use in Leo's survey?
A: Bus
In Jan's survey?
A: Car

2. How many fewer students come by car in Leo's survey than in Jan's survey?
A: 11 - 7 = 4; 4

3. How many students were surveyed in each class?
A: In order to find the answer to this problem, we would need to add all
the bars in Leo's data and all the bars in Jan's data.
Leo's class: 7 + 10 + 4 = 21; 21 students
Jan's class: 11 + 8 + 2 = 21; 21 students