Question

Paula's grades on her history tests this semester are: 79,93, 92, 86, and

90. What is the mean absolute deviation (MAD) of Paula's history grades?
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Answer 1

The MAD is 4.4.

Explanation:

1. 79+93+92+86+90/5= 88= Mean.

2. Apply |values - mean| 9+5+4+2+2=22

3. Divide by total of values, 22/5= 4.4.

Answer 2

4.4

Explanation:

Data set = 79, 93, 92, 86, 90

Xmean = (79 + 93 + 92 + 86 + 90)/5

= 440/5

Xmean = 88

MAD =

(79 - 88) + (93 - 88) + ( 92 - 88) + ( 86 - 88) + ( 90 - 88)/ 5

=

(9) + (5) + (4) + (2) + (2)/ 5

=

22/5

Mean Absolute Deviation = 4.4