# Histograms Review Mean, median, mode - PowerPoint PPT Presentation

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Histograms Review Mean, median, mode. Grade 8 Math. Minds On. Please define histogram: A graph with bars that show frequencies of data organized into intervals; the intervals line up side by side, without gaps, in the number line.

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Histograms Review Mean, median, mode

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## Histograms ReviewMean, median, mode

### Minds On

• A graph with bars that show frequencies of data organized into intervals; the intervals line up side by side, without gaps, in the number line

### Please choose the best graph that can represent the data below:

• When you want to display the height of a class to see how many students in one class meet the height requirement required by attractions in Wonderland

• A. a bar graph

• B. a pictograph

• C. a line graph

• D. a scatter plot

• E. a stem-and-leaf plot

• F. a circle graph

• G. a Histogram

### Please choose the best graph that can represent the data below:

• When you want to see how much percentage of Tax is spent on Education:

• A. a bar graph

• B. a pictograph

• C. a line graph

• D. a scatter plot

• E. a stem-and-leaf plot

• F. a circle graph

• G. a Histogram

### Please choose the best graph that can represent the data below:

• When you try to see whether the students in the class prefer hockey or soccer

• A. a bar graph

• B. a pictograph

• C. a line graph

• D. a scatter plot

• E. a stem-and-leaf plot

• F. a circle graph

• G. a Histogram

### Please choose the best graph that can represent the data below:

• When you want to see the biggest improvement time period of a hockey team

• A. a bar graph

• B. a pictograph

• C. a line graph

• D. a scatter plot

• E. a stem-and-leaf plot

• F. a circle graph

• G. a Histogram

### Please choose the best graph that can represent the data below:

• When you want to find out the relationship between two values

• A. a bar graph

• B. a pictograph

• C. a line graph

• D. a scatter plot

• E. a stem-and-leaf plot

• F. a circle graph

• G. a Histogram

### Please choose the best graph that can represent the data below:

• When you want to see how long roughly it takes 32 students to go to school

• A. a bar graph

• B. a pictograph

• C. a line graph

• D. a scatter plot

• E. a stem-and-leaf plot

• F. a circle graph

• G. a Histogram

### Homework Checking

• Please check homework 4 and 8

## Mean, Median and Mode

### Definition & Calculation

• Mean:

• Median:

• Mode:

2, 4, 8, 9, 10, 12, 15, 18, 20, 22

• Comparing groups of data by:comparing the mean, median & mode

### Experiment

• Demonstration: volunteer for dropping and recording?

• Calculation:

• Mean:

• Median:

• Mode:

• Group!

• One dropper

• One catcher & recorder

• Repeat the experiment for 10 times, record the response times down

• Switch with your partner, repeat for 1o times, record the response times down

• Calculation:

• The mean, median and mode (3m)

• Drop the least measurement & recalculate the 3m

• Drop the greatest measurement & recalculate the 3m

• Drop both the least and the greatest & recalculate the 3m

• ### Think:

• Was the mean, the median, or the mode affected more by leaving out the least and greatest measurements? Why?

• Was the mean, median, or the mode a better indicator of your reaction time?

### Think:

• Textbook Page 110 Question 4

### Ticket-Out-Of-The-Door

• One new thing that I have learned today

Homework

• Textbook 109 example 1 & page 110, question 5, 7