Annual salaries of pharmacists are normally distributed with the middle 97% of pharmacists earning between $83,220.50 and $110,779.50. Standard Normal Distribution Table What are the mean and standard deviation of the annual salaries for pharmacists? Mean: [.1 = SD: 6 = Round to the nearest dollar. For the midterm exam in a Statistics class, the mean grade is 63, the median is 68, the mode is 70, and the standard deviation is 8. a. What can be said about the shape and skewness of the distribution? 0 It is left (negatively) skewed. Q It is right (positively) skewed. C) It is symmetrical (i.e. zero skewness). 0 It is uniformly distributed. 0 Not enough information to determine. b. The professor decides to give everyone an additional 2 marks on the exam. i. How does this change the mean, median and mode? 0 Only the mean increases by 2. 0 Only the median increases by 2. 0 Only the mode increases by 2. 0 Both the mean and the median increase by 2 but the mode does not change. 0 All three measures of center increase by 2. ii. How does this change the standard deviation? 0 It increases by a factor of 2. Q It increases by a factor of x/E. 0 It does not change. 0 It decreases by a factor of x/Z 0 It decreases by a factor of 2