Warm-Up

Bar Graphs and Dot Plots

1.1

Objective

• Create and interpret bar graphs and dot plots

Bar Graph

• It uses the scale on the vertical axis to measure the height of each bar.

• useful when comparing data, easy to see the differences in categories.

Example 1: Comparing Colorado Mountains.

• Pikes Peak is 14,115 ft• Mount Elbert is 14,440 ft• Castle Peak is 14,279 ft• Treasure Mountain is 13,535 ft• Longs Peak is 14,259 ft

Example 1:Cont

• What is the tallest mountain?

• What is the lowest?

• What is the difference in hight between the two?

Vocab• The greatest # in the set is the Maximum

• The lowest # in the set is the Minimum

• The difference between the Max and the Min is called the Range.

Range = Max - Min (simply subtract)

Example • What is the minimum sales?• What is the maximum sales?• What is the range?

Example • How many

students had a birthday in July?

• Which month did 7 students have birthdays?

You try!

Below is data showing student’s favorite classes. Build a bar graph displaying the data.

Class Math English History Science

# of Students

6 10 8 5

Moving on…

Pictograph

A graph that uses pictures or symbols to represent data.

• How many Golden Delicious apples are there?

You Try!

Jessica brought snacks for her friends today.She brought 5 fruit roll-ups, 3 bags of chips and 4 cans of Coke.

Create a Pictograph displaying the snacks she brought.

Easy! Moving on again

Dot Plot

A dot plot is similar to a pictograph except we use dots instead of pictures.

Example

• How many siblings do you have? • For each person, we will add a dot to the

number line.

• ______ students have 2 siblings. • ______ have more than 3 siblings.

Homework

• 1.1 Worksheet

• All Problems