Mad

Mean Absolute Deviation

Multiple Select

How do you find the mean of a set of numbers?

• add, then multiply by how many numbers there are

• add, then subtract by how many numbers there are

• add, then divide by how many numbers there are

• it's the same as the average

1) First, find the mean.
2) Find the difference of each data point from the mean.
3) Find the mean of the differences.

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Let's find the MAD!

Multiple Choice

How do you find the MAD of a set of numbers?

• 1) Find the mean.

  2) Hope and pray that the right answer falls out of the sky.

• 1) Find the mean.

  2) Find the difference of each data point from the mean.

  3) Find the mean of the differences.

Multiple Choice

#1) Find the mean: 50, 30, 8, and 4

• 23

• 92

• 4

• 13

Match

#2) Match how far each data point (at the top) is from the mean of 23.

(Subtract each number from 23.)

• 50

• 30

• 8

• 4

27

7

15

19

• 27

• 7

• 15

• 19

Multiple Choice

#3) Find the MAD: 50, 30, 8, and 4.

(Remember, the differences you got on Step 2 were 27, 7, 15, and 19. Find the mean of those numbers!)

• 23

• 68

• 4

• 17

Multiple Choice

#4) Find the mean: 18, 14, 20, and 12.

• 4

• 16

• 20

• 64

Match

#5) Match how far each data point (at the top) is from the mean of 16.

(Subtract each number from 16.)

• 18 and 14

• 20 and 12

• Mrs. Bothers

2

4

math teacher

• 2

• 4

• math teacher

Multiple Choice

#6) Find the MAD: 18, 14, 20, and 12

(Remember, the differences you got on Step 2 were 2, 2, 4, and 4. Find the mean of those numbers!)

• 3

• 4

• 6

• 12

Multiple Choice

#7) Find the mean: 11, 4, 6, and 7

• 28

• 12

• 7

• 6

Match

#8) Match how far each data point (at the top) is from the mean of 7.

(Subtract each number from 7.)

• 11

• 4

• 6

• 7

4

3

1

0

• 4

• 3

• 1

• 0

Multiple Choice

#9) Find the MAD: 11, 4, 6, and 7

(Remember, the differences you got on Step 2 were 4, 3, 1, and 0. Find the mean of those differences!)

• 8

• 4

• 2

• 1

Multiple Choice

#10) Find the MAD: 1, 6, 8, 10, 20

(Remember, find the mean. Then, find the differences. Then, find the mean of the differences.)

• 1.2

• 4.8

• 5.6

• 9

Draw

Draw Sponge Bob.