This is Project management question

Problem 2: Given the information: Part 1 - Complete the table by calculating the expected time, variance and standard deviation for every task. Replace the "?" with your values. (15 points) Place a " Y " in the last column, if the activity is critical. Place an " N " in the last column, if the activity is non-critical. Part 2: Answer the questions below and replace the "?" with your values. (Show how the numbers are derived.) (20 points) 2.1. Expected completion of this project is? ? 2.2. Standard deviation of ciritical path is? ? 2.3. Probability of finishing this project 7 days sooner is? ? 2.4. Number of days needed to complete this project with an 80% probablity of being met is? ? Part 3: Given the information for this project, which activity do you think poses the most risk when it comes to having this project completed by its expected completion time? Explain your answer. And, if you are pointing out more than one activity, start the list with the riskiest, and then go down your list and explain your answer for each activity you chose to include. (5 points)