Here are two datasets: Dataset A: 64 65 66 68 70 71 72 Dataset B: 64 65 66 68 70 71 720 For dataset A, the mean and median are 68. Looking at dataset B, notice that all of the observations except the last one are close together. Which measure will be affected by this last observation in dataset B? Mean or Median Solution Data set B: Mean will be affected since we have outlier(720) in the data hence we know that outlers are very much affected by mean . But no affect on the Median.