e.g. What percentage of people have an IQ above 120 if the mean = 100 and the st dev = 16? Please note that we will be lenient about proper symbols due to the problems typing formulas. Here is what would be considered a complete answer. Z = (X-u)/o = (120-100)/16 = 20/16 = 1.25 area (col C) = .1056 Therefore, 10.56 % of people have an IQ above 120. 1a) . You work as a statistician for a hospital. You have just finished analyzing the data for how long it took 124 surgeons to complete an appendectomy. The average number of minutes required to complete the surgery was 59 minutes (st dev = 7.5). How many surgeons finished the surgery in less than 53 minutes? 1b) Using the data from question 1a) what proportion of surgeons took more than 47 minutes? 1c). You received a grade on an exam of 77%. If your grade was 1.4 standard deviations above the mean, 328 students wrote the exam, and the standard deviation was 11%, what was the mean grade for the entire class? 1d. Using the same data (and your answer) from question 1c, how many standard deviations above the mean would you have to be if you wanted to be in the top 3% of your class? What actual mark (as a %) would need to be in the top 3% of the class