Ross Hopkins, president of Hopkins Hospitality, has developed the tasks, durations, and predecessor relationships in the following table for building new motels.

a$)$ The expected $($estimated$)$ time for activity $C$ is $13\mathrm{.}84$ weeks. $($Round your response to two decimal places.$)$

b$)$ The variance for activity $C$ is $,$ weeks. $($Round your response to two decimal places.$)$

c$)$ Based on the calculation of the estimated times, the critical path is $A-C-F-H-J-K$

d$)$ The estimated time for the critical path is weeks. $($Round your response to two decimal places.$)$