65 70 71 75 93 94 75 6 68 80 a) Calculate the i) mean 2. The following is a list of unit 1 test grades for a sample of selected students from MATH 1080. ii) median iii) mode iv) standard deviation (and interpret)(round to 2 decimal places) for this data. b) Is this data symmetrical, right-skewed, or left-skewed? Justify your answer. 3.. The age of all passengers in business class on the 1 pm flight to Edmonton today are 38, 26, 13, 41 and 22. a) Determine the standard deviation in this population. X b) Interpret your answer. (x-) 4.. A sample study of incomes of executives and unskilled workers at Nash Products Inc. is taken and the following statistics are calculated. Executive Sample mean (= $500,000 sample standard dev. = $50,000 Unskilled worker Sample mean (= $32,000 sample standard dev. = 3,200 Using the coefficient of variation determine which group has greater variation in their salaries?