10)a. i know the answer is 2.5% but I don't know how they got that answer

factors vary together, or show a pattern of being related. 10A) If the data of a test with an average of 80 and a standard deviation of 10 fall into a normal distribution, 2.5% % of test-takers scored 100 or higher (+2 sd above the mean). 10B) If the data of a test fall into a positively skewed distribution, most test-takers performed poorly (well, moderately well, poorly), but a few scores were high, which pushed up the mean