I need help with Question 2 please!! Thank you

Moore Housing Contractors (MHC) Moore Housing Contractors is negotiating a deal with Countryside Realtors to build six houses in a new development. Countryside wants Moore Contractors to start in late winter or early spring when the weather begins to moderate and build through the summer into the fall. The summer months are busy for the realty company, and it believes it can sell the houses almost as soon as they are ready-sometimes before. The houses have similar floor plans and are approximately equal in size; only the exteriors are noticeably different. The completion time is so critical for Countryside realtors that it is insisting a project management network accompany the contractor's bid for the job with an estimate of the completion time for a house. The realtor also needs to plan its offerings and marketing for the summer. The realtor wants each house to be completed within 45 days of starting. If a house is not completed within this time frame, the realtor wants to be able to charge the contractor a penalty. The MHC is concerned about the prospect of a penalty. They want to be confident they can meet the house's deadline before entering into any agreement with a penalty involved. Moore has experienced house builders, so it was not difficult to list the activities involved in building a house or estimate activity times. However, they made their estimates conservatively and tended to increase their pessimistic estimates to compensate for the possibility of bad weather and variations in their workforce. Table 1 shows a list of the activities for building a house and the activity time estimate. QUESTION 1. Develop a network diagram for MHC and determine the contractors' probability of completing a house in 45 days or less. DO NOT round up/down the calculated expected time. Keep it at two decimal points. TABLE 1 Time (Days) Activity Description Predecessor Excavation nour.footers a none 4 QUESTION 1. a 4 4 Develop a network diagram for MHC and determine the contractors' probability of completing a house in 45 days or less. DO NOT round up/down the calculated expected time. Keep it at two decimal points. TABLE 1 Time (Days) Activity Description Predecessor m b A Excavation, pour footers none 3 6 B Lay foundation A 2 3 5 C Frame and roof B 2 5 E Sewer (floor) drains B 1 2 3 F Install insulation 2 4 5 G Pour basement floor E 2 3 5 1 Install windows F 1 4 Rough electrical wiring 1 4 Install furnace C G 3 5 Exterior brickwork 5 10 M Install plasterboard JK 12 Roof shingles 2 3 Attach gutter 1 2 Grading 2 3 Lay subflooring Lay driveway 10 Kitchen, sink, appliances 8 Painting 6 10 Finish wood floor 8 00 uuwu u olo F --Ezod >> NANANNOU NN NNW 6 uzo zad> oo NW 00 on UN WANAW SonNO 4 00 2 W wo 4 QUESTION 2. Use the Normal time given in Table 2 to reduce the project by 7 days. What is the total added cost? Show the activity/activities that need to crash for each day. For example, what activity to crash for day 1, what activity to crash for day 2, and so forth: TABLE 2 Time (days) Activity cost (5) Activity Description Predecessor Normal Crash Normal Crash Excavation, pour footers none 6 4 $10 20 Lay foundation 5 3 $22 28 Frame and roof 5 $15 22 Sewer (floor) drains 3 $21 25 Install insulation 5 4 $25 30 Pour basement floor 5 $12 18 Install windows 4 3 $20 22 Rough electrical wiring 3 2 $20 20 Install furnace CG 8 $11 23 Exterior brickwork 8 6 $16 28 M Install plasterboard J, 10 $18 Roof shingles 4 3 $23 29 Attach gutter 5 2 $25 31 Grading 7 3 $12 16 Lay subflooring 5 $17 22 Lay driveway 8 6 $20 30 Kitchen, sink, appliances 4 $18 28 Painting 6 $15 24 w Finish wood floor 6 $25 34 3 5 com wuuu - ZOO-> 8 ww-X-EZO>> 26 4 00 00 00 00 doo