How to Find Mean Absolute Deviation

What is the purpose of mean absolute deviation?

• to find the mean

• to represent the center of the data

• to show how much variation there is

• to confuse 7th graders

What is absolute value?

• the average

• a number's distance from zero

• how much something is worth

• the mean

What is the first step in determining the M.A.D. of a data set?

• find the mode

• find the mean

• find the median

• find the range

What does deviation mean?

• the sum

• the product

• the quotient

• the difference

Which 3 measures show the variation of a data set?

• mean, median, mode

• mean, median, range

• medain, IQR, M.A.D

• range, IQR, M.A.D

Which best describes what variations is?

• The average of a data set

• The center of a data set

• How spread out the numbers are in a data set

• How big the numbers are in a data set

Here are some 7th grade heights in inches: 60, 64, 48, 72, 62,70,50,62. Which answer shows the first step for finding the M.A.D?

• $\sqrt{844}$

• 844 $\times$ 8

• 844 $\div$ 8

• $844^2$

Which shows the deviation of each of the heights(in.) from the mean height? 60, 64, 48, 72, 62,70,50,62

• -1, 3, -13, 11, 1, 9, -11,1

• -2, -3, -13, 2, 3, 13, 11, 1

• -1, 2, -9, 11, 13, -3, 9, -2

The following are the ages of volunteers at a marathon: 16,27,31,24,19, and 63. What is the mean absolute deviation of the ages?

• 11.3

• 11.6

• 12.3

• 12.6

What step comes after finding the difference of each data point and the mean when finding M.A. D?

• finding the sum

• connecting the lines on the box-plot

• listing the data points from least to greatest

• finding the absolute value