3. For my last stats final exam, 56 students took the exam. The mean score of 7'2 came from a range of scores from 42 to 94: E?) a. How many final exam grades would need to be sampled to be 94% confident that I am within 2 points of population mean for all stats final exams?I (150 homework pts or 3 test pts) b. Construct the 86% confidence interval of the population mean of final exam scores for the sample of 56 test scores. (150 homework pts or 3 test Dtsl