3. The provider of a certain cell phone plan randomly selects a sample of 20 customers who have been on the plan for one year. Each customer in the sample is asked to rank his or her satisfaction with the plan on the following 10-point 1 2 3 4 5 6 7 8 9 10 Not Fairly Extremely scale: Satisfied Satisfied Satisfied The following rankings are obtained: 1, 5, 7, 8, 9, 10, 8, 10, 9, 10, 9, 8, 8, 9, 5, 8, 9, 3, 10, 8 a) Determine the mean, median, and mode of the customer satisfaction rankings? (3 marks) b) Determine the range of the rankings. (1 mark) c) Calculate the first and third quartiles, and the interquartile range. (3 marks) d) Identify any potential outliers