Measurements of Central Tendency

Measures of Central Tendency

Todays Agenda

Brief Video on Mean,

Median, Mode

Go through slideshow on

Central tendency & Range

Group work activity

Kahoot

What are the measures of central tendency?

Erin surveyed 4 friends on the number of first cousins each has. To find a number that best represents the number of cousins, Erin used linking cubes.

Alec 3

Julia 4

Matthew 4

Dylan M 9

​Example:

Example:

One way to find the mean is to rearrange the cubes to make rows of equal length.

Alec

Julia

Matthew

Dylan M

Multiple Choice

Find the mean of the following:

7, 13, 6, 2

• 28

• 7

• 4

• 6

​Example:

There are 11 Grade 7 students in Mr. Dandy’s combined Grades 6 and 7 class. To find the median mark on the last science test, he listed their marks from greatest to least: 95, 92, 87, 85, 80, 78, 76, 73, 70, 66, 54

Find the median:

Example:

Now what if another student transfers to Mr. Dandy's class?
They write the same test and receive a mark of 72. To find the new
median this mark must be included in the ordered list:
95, 92, 87, 85, 80, 78, 76, 73, 72, 70, 66, 54.

What is the new median?

Multiple Choice

Find the median of the following:

7, 8, 3, 4, 8

• 3

• 4

• 8

• 7

Example

Here are KJ’s practice times, in seconds, for the 100-m backstroke:
121, 117, 123, 115, 117, 119, 117, 120, 122

Find the mode of this data.

Multiple Choice

Find the mode.

7, 8, 3, 4, 8

• 4

• 3

• 8

• 7

Example:

The hourly wages, in dollars, of 10 workers are:
8, 18, 10, 8, 15, 11, 9, 11, 12, 20

Find the range of the data set:

Multiple Choice

Find the range of the following:

3, 7, 8, 11, 2, 7

• 9

• 7

• 11

• 2

Open Ended

Every time it snowed this winter, Maddy measured the amount of snow on the ground. The measurements for each snowfall are:

7, 3, 6, 4, 7, 3, 5, 3

Find the Mode, explain how you got this answer?

Open Ended

Dylan has seven cousins their ages are:

3, 5, 7, 13, 16, 18, 22

What is their mean age? What is the range? please answer the question and explain how you got this answer.

Word Cloud

Please choose a number 1-20

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Draw

Please find the mean, median, mode and range for the data. and write your groups answers on the canvas.

Kahoot!

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Poll

So class, how do you feel about measurements of central tendency and range?

• I don't understand

• I understand some of it

• I feel alright

• I feel great

You all did AMAZING!

Thank you for participating!