The heights of the trees for sale at two nurseries are shown below. heights of trees at yard works in feet : 7, 9, 7, 12, 5 heights of trees at the grow station in feet : 9, 11, 6, 12, which statements are true regarding the measures of center and variability of these data sets? check all that apply the mean of tree heights at yard works is 7 feet the mean of tree heights at yard works is 8 feet the mean of tree heights at the grow station is 9 feet the mean of tree heights at the grow station is 10 feet the mean absolute deviations of the tree heights at both yards is 2the mean absolute deviation of the tree heights at both yards is 3