Why does the addition of the number 38 to each data set change the mean for Set A more than it does for Set B? Set B has a smaller number of data values than set A, so to find the mean of B we divide the sum of the values by a smaller value than for A. Set B has a larger number of data values than set A, so to find the mean of B we divide the sum of the values by a smaller value than for A. Set B has a smaller number of data values than set A, so to find the mean of B we divide the sum of the values by a larger value than for A. Set B has a larger number of data values than set A, so to find the mean of B we divide the sum of the values by a larger value than for A