Explain Quantitative analysis: PERT

Problem- A project having the following six activities:

Activity Immediate Crash

Predecessors Time (weeks) Max Crash cost per week

i. None 7 7 N/A

ii. None 3 2 $750

iii. i 5 3 $1,000

iv. i, ii 6 4 $2,000

v. iii, iv 4 3 $1,250

vi. iv 3 2 $1,000

Part1- Draw the project network and list the earliest start (ES), earliest finish (EF), latest start (LS) and latest finish (LF) for each task

Part 2- List the tasks on the critical path

Part 3- What is the expected project duration in weeks?

Part 4- What is the slack for each activity?

i: ________ ii:_______ iii:________ iv:_______ v:_______ vi:_______

I need help to explain set deal with questions under quantitative analysis: Program Evaluation and Review Technique (PERT).