Ineed with both questions :
part a:
a coffee shop uses 4 l of milk every day. if there are 15 l of milk in the fridge, after how many days will more milk need to be purchased? explain how you know

part b:
if only half as much milk is used each day, after how many days will more milk need to be purchased?

Using pert, adam munson was able to determine that the expected project completion time for the construction of a pleasure yacht is 21 months, and the project variance is 4. a) what is the probability that the project will be completed in 17 months? b) what is the probability that the project will be completed in 20 months? c) what is the probability that the project will be completed in 23 months? d) what is the probability that the project will be completed in 25 months? e) what is the due date that yields a 95% chance of completion?