please answer these . need urgently

Time Rem 14 3 points A project has four activities: A, B, C, D. Their durations are 4, 3,6 and 7 days, respectively. What is the total completion time for the project? (Difficulty level-tas 7 days, because this is the maximum activity time 3 days, because this is the minimum activity time 20 days, because this is the sum of the activity times It is not possible to determine the total completion time from the given information Ne 9 4 points A fast-food restaurant can on average serve 12 customers in one hour. The standard deviation of the service time is 4 minutes. What is the coefficient of variation of the service time? (Difficulty Level - Medium) 0.8 3 0.33 48 Next Previous 8 5 points Cranston Cranberry Cooperative (CCC) processes cranberries that are harvested in the local area. Barrels of cranberries arrive on trucks to CCC's facility stanwege rate of barrels per hour. The average processing time of one barrel of cranberries is 10 minutes. The coefficient of variation of the arrival process is 1.7.The coefficient of variation of the service process is 1. On average, how many barrels of cranberries are waiting in line? (Round off your answer to the FIRST decimal point)(Difficulty Level - Hardi Note: the questions asks about the number of barrels infine, NOT the waiting time in line. Type your