12. The following values are the number of days overdue a sample of 30 individuals paid their cable TV bill. 1, 5, 4, 21, 1, 5, 4, 17, 1, 6, 15, 4, 1, 5, 3, 10, 5, 1, 10, 3, 2, 8, 8, 2, 9, 3, 1, 7, 2, 7 a) What is the percentile rank of 9 days? b) Find 20th percentile. 13. a) Find the 5 number summary for the above data set. b) Find the interquartile range. c) Find the lower and upper outlier boundaries. Are there any outliers? d) Draw a box plot or a modified box plot as appropriate