Please can you help me!

Question 5. a) What different types of dummies are needed to construct project planning networks? Explain why these dummies are needed. [4 marks] 1:) The following precedence table gives details of a project to build a garage. Activity Description Preceding Duration [days] Activity A Hire briddayer 7 10 B Dig foundations 8 C Lay the base B 1 D Build walls A, C 6 E Construct roof D 3 F Tile roof E 2 G Make window frames 3 H Fit window frames D, G 1 I Fit glass H 1 J Fit door E 1 K Paint windows and door I, J 2 L Point brickwork D 2 (i) Explain how you can identify if any dummies are required in a network for this project by looking at the precedence table. Which, if any, are needed in the network for this project? [3 marks] (ii) Draw the network for this project. [4 marks] (iii) Calculate the earliest and latest event times for each node. [4 marks] (iv}What is the shortest duration for this project? [1 mark] (v) Calculate the oat for each activity. [2 marks] (vi}Write down any critiml paths through the network. [2 marks]