Martin earned the following scores on his last five tests.
98, 78, 84, 75, 91
what is the mean absolute deviation of his scores?
37.2
0
6.2
7.44

So, first add all the numbers together. 37.2 + 0 + 6.2 + 7.44 = 50.84
Now, however many numbers were added (which is 4 if you count them above) divide 50.84 by that. So, 50.84 divided by 4 (numbers in all) = 12.71

The 'mean absolute deviation' is 12.71

Hope this helps!! :)

The answer is the first one