Histogram Whiteboard Activity 4.18.12

Is the following a histogram?

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0-45-9

10-14 15-19

Trips to Busch Gardens

# of Trips

Ti

mes

Went

Is the following a histogram?

0123456789

10

Red Orange Yellow Green Blue Purple

Favorite Colors of Students

Color

# of

Stu

dent

s

What is wrong with the following histogram?

4'1" to 4'6" 4'7" to 5'0" 5'0" to 5'6" 5'7" to 6'0"0

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What is wrong with the following histogram?Answers:• No title• Unequal intervals• Intersecting intervals• No labels• Gaps between bars

Fix it!

4'1" to 4'6" 4'7" to 5'0" 5'0" to 5'6" 5'7" to 6'0"0

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12

Fix it!

4'1" to 4'6" 4'7" to 5'0" 5'0" to 5'6" 5'7" to 6'0"0

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12

Heights of Students

Heights

# of

Stu

dent

s

Make a histogram!Before you begin…Ages of students taking Algebra 1:14, 15, 11, 13, 13, 14, 12, 13, 13, 19, 13, 12, 14, 14, 13, 14, 11, 12, 15, 13

What is the first step?

Make a histogram!Organize your data!Sort the data from least to greatest!11, 11, 12, 12, 12, 13, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 15, 15, 19Give the mean, median, and mode.Mean: 13.4, Median: 13, Mode: 13What is the range?Range: 8

Make a histogram!Organize your data!What’s a good interval to use?Make a frequency table with intervals of 3.

Now create a histogram with the above table!

Age Tally Frequency11-13 IIII IIII II 12

14-16 IIII II 7

17-19 I 1

Make a histogram!Your histogram should look like:

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11-13 14-16 17-19

Ages of Students in Algebra I

Age

# of

Stu

dent

s

Evaluating a histogram

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1-2 3-4 5-6 7-8 9-10

Time Spent Studying for the Quiz Tomorrow

Number of Hours

# Students

What are the intervals for this histogram?

2How many students studied between 3 and 6 hours?

14How many students studied for more than 5 hours?

7

Now it’s time for some…

COMPETITION!!!

What is wrong with the following histogram?

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6

Trash from the Cafeteria

Time of Day

Bag

s of

Tra

sh a

t the

Caf

eter

ia

Evaluating a histogramWhat are the intervals for this histogram?

How much data is less than ???

How much data is between ???

Evaluating a histogramWhat are the intervals for this histogram?

50How many colleges got than 450?

43How many colleges are between 600 and 800?

15

Evaluating a histogramWhat are the intervals for this histogram?

5How many families spend less than $30?

35What is the mode?

Not enough information

Time for some…Comparison!

Compare and contrast:

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0 to 910-19 20-29 30-39

Hot Dogs Eaten in Con-test

Hot Dogs Eaten

# of

peo

ple

Hot Dogs Eaten in Con-test

0 to 910 to 1920 to 2930 to 39

Compare and contrast:

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0 to 910-19 20-29 30-39

Hot Dogs Eaten in Con-test

Hot Dogs Eaten

# of

peo

ple

Hot Dogs Eaten in Contest

Mode? Median?Make a Line Plot.

Compare and contrast:

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0 to 910-19 20-29 30-39

Hot Dogs Eaten in Con-test

Hot Dogs Eaten

# of

peo

ple

With…Your Line Plot!

Now it’s time for……BOOKWORK!