help please

Regina is a Project Manager at a cracker factory, and is deciding which of three vendors to use to install a new cracker boxing machine. There is a 50% chance that Vendor A can complete the job in 7 weeks, a 25% chance that they will take 9 weeks, and a 25% chance they will take 14 weeks. Vendor B can deliver and install in 5 weeks if everything 'goes extremely well...which has a 20% chance of happening. They estimate a 40% chance that there will be 'significant shipping issues' which would result in the project taking 18 weeks. Under all other conditions the project will take 11 weeks. Finally, Vendor C'guarantees' installation by week 10. Regina's goal is to find the vendor with the earliest expected completion time. Which vendor should she choose? [ Select ] What is the expected completion time of her choice? [Select ] What are Regina's cost savings by choosing this vendor? Cannot determine from this data