+614 In a normally set of scores from a class of 25 students, how many z-scores are greater than -1
+37146 z-score of -1 is one standard eviation from the mean and = .1841 or 18.41 %
18.41 are below and 100-18.41 =81.59 % of the scors are higher
+37146 **** add- on ****
81.59% * 25 students ~~~ 20 scores higher than z - score = -1
