Problem on PERT/CPM

Hi Good day everyone

Really appreciate if you can help me to solve problem as per details on pict attached, and determine :

(i) Draw the PERT network for the project.

(ii) Prepare the activity schedule for the project.

(iii) Determine the critical path.

(iv) If a 25-week deadline is imposed, what is the probability that the project will be finished within the time limit?

thank you so much for your kindly help