Construction project management , please solve this issue as soon as possible and give me the solution

Ql. Based on the table below, solve the questions (1-4), (12 Marks) Activity Predecessor Optimistic Most Likely Duration Duration 2 4 B 5 8 H B 1 2 H 4 10 D B 4 7 E 11 14 F DE 9 13 G EE 2 5 Pessimistic Duration 10 15 3 12 9 21 7 1. What is the probability that the project finishes in less than 10 days 2. What is the probability that the Activity "G" finishes between 3 and 5 days 3. Estimate project completion date with at least a 96% confidence level 4 What is the probability that node "D" has a float more than Zero