The following data are the overtimes in minutes done by the employees during the month. Data Frequency 12-14 2 15-17 8 18-20 11 21-23 10 24-26 9 27--29 O a- Develop Relative and percentage of frequency (2marks) b- Develop a histogram (2marks) c- What percentage of employees worked for 18 to 20 minutes. (1Mark) d- What percentage of employees worked more than 23 minutes. (1Mark) f- Comment on what you find in the table. (4Marks)