Courier Service Company Express-way provides service that allows someone to send parcels from one location to another domestically. The real-time tracking system helps the company to track the number of riders needed for particular time periods (hours).

Table 2

Time (Hours)	Cumulative  Frequency	Frequency,  (the Riders)
1 – 3	3
4 – 6	10
7 – 9	20
10 –12	33
13 – 15	52

• Fill in frequency in the Table 2.
                                                                                                                                  (2 mark)                                                       
  
• Compute the standard deviation.
                                                                                                                                 (5 marks)
• Given that the mean of courier time for Express-way is 10.19. The standard deviation and mean of courier time of another company named Fast-delivery are 5.4773 and 12 respectively. Compute the coefficient of variation for both companies. Which company’s courier time is more dispersed?
•                                                                                                                                (5 marks)