Answer:
MAD mean absolute deviation = 18.9
Explanation:
mean: 26 + 34 + 66 + 71 + 76 + 82 + 88 + 95 = 538/8 = 67.25
26 - 67.25 = 41.25
34 - 67.25 = 33.25
66 - 67.25 = 1.25
71 - 67.25 = 3.75
76 - 67.25 = 8.75
82 - 67.25 = 14.75
88 - 67.25 = 20.75
95 - 67.25 = 27.75
(MAD) mean absolute deviation: 41.25 + 33.25 + 1.25 + 3.75 + 8.75 + 14.75 + 20.75 + 27.75 = 151.5/8 = 18.9