Sample Final Exam II 1) It is known that the distribution of grades of a reading test for ten year olds is normally distributed with mean = 90 and standard deviation = 15. Find the percentage of ten year olds who get grades: a) Between 60 and 120. b) Under 114 c) Over 60 d) Over 150 e) Find the 30th percentile. 2) The mean weight of members of a Weight Watchers chapter is 250 lbs. The standard deviation is 24 lbs. If a sample of 36 members is taken, find the probability that: a) The mean weight is more than 260 lbs. b) The mean weight of the sample is within 4 Ibs. of 250