1) A sample of 33 students was asked to rate themselves on whether they were outgoing or not using this five point scale: 1=extremely extroverted, 2 = extroverted, 3 = neither extroverted nor introverted, 4 = introverted, or 5 = extremely introverted. The results are shown in the table below: %3D Rating x, 1 3 4 Frequency f 7. 20 5 a) Calculate the sample mean. b) Calculate the median. c) Calculate the sample standard deviation. d) Find the percentage of measurements in the intervals ts and x+2s. Compare these results with the Empirical Rule percentages, and comment on the shape of the distribution.