hi there can you please help me answer questions 5 and 6?

Predecessor PESSIMISTIC A(OPTIMISTIC NORMAL 3 S 20 6 A Existing item removal 3 4 7 1 3 5 B. Electrician A11 C. Painting AS D. Wallpaper B4 installer 2 4 7 2 5 E New C2 furniture Place in the position as the design plan F. Install new D2 furniture. chair and dining table Completion E 1 2 1. Draw the Activity on Arrow network diagram for this project 2. The mean and standard deviation for each activity 3. Calculate the mean and standard deviation for each path 4. Identify the critical path and its expected length 10 10 5 2 5. From the information listed in the table, Draw a pareto diagram reflecting the respective defects. Defects Activity A 20 B 11 C 5 D 4 E 2 F 2 G 1 10 6. Investigate the activity with the highest defect by drawing a fishbone or cause and effectto highlight the possible cause to the problem 10 7. Provide possible solutions to the cause/s identified 8. Differentiate between quality assurance and quality control 15 3