Question: Need help with these 3 questions, absolutely lost right now. Please show how you arrived at answer if possible Chapter 14 Use the network diagram

Need help with these 3 questions, absolutely lost right now. Please show how you arrived at answer if possible

Chapter 14 Use the network diagram below to answer the following one question: 3. Which of the paths through the network is the critical path? 4. Using the table below, calculate the expected time for activity and the variance of estimated time for activity for activities A-D

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