this is one whole question

Consider the following project network C H Start Finish D F B E Suppose that the following estimates of activity times (In weeks) were provided for the network shown above. Activity Optimistic Most Probable Pessimistic 4.0 5.0 6.0 B 2.5 3.0 3.5 c 6.0 7.0 8.0 D 5.0 5.5 9.0 E 5.0 7.0 9.0 F 2.0 3.0 4.0 G 8.0 10.0 12.0 H 6.0 7.0 14.0 Suppose that the following estimates of activity times in weeks) were provided for the network shown above Activity Optimistic Most Probable Pessimistic A 4.0 5.0 6.0 8 215 3.0 3.5 C 6.0 7.0 8.0 D 5.0 5.5 9.0 m 5.0 7.0 9.0 F. 2.0 3.0 4.0 G 8.0 10.0 12.0 H 6.0 7.0 14.0 What is the probability that the project will be completed within the following time frames? (Round your answers to four decimal places. You may need to use the appropriate technology to answer this question) (*) within 19 weeks? (b) Within 22 weeks? (c) within 23 weeks