Assuming that am supposed to calculate the the mean absolute deviation of 1,2,3,4,5,6,7 mean absolute deviation is calculated by first calculating the mean; (1+2+3+4+5+6+7) =28/7 = 4 Then, find the absolute value (the difference between each value in the data and the mean) (x-μ) = -3,-2,-1,0,1,2,3 Absolute values= 3,2,1,0,1,2,3 Then we find the mean of the values, 3+2+1+0+1+2+3 = 12 = 12/7 = 1.7143 Therefore, the mean is 4, and the Mean absolute deviation is 1.7143