Answer
The sample mean absolute deviation is not an unbiased estimator of the mean absolute deviation of a population.
Work Step by Step
Mean: sum of all values divided by number of values: $mean=\frac{0+1+6+1+0+5+6+5+0}{9}=\frac{8}{3}\ne\frac{22}{3}.$
Hence the sample mean absolute deviation is not an unbiased estimator of the mean absolute deviation of a population.
