handwritten solution please, Thank you

[Part 1 of 2] Consider the network below with optimistic, pessimistic and most likely activity durations listed (durations given in doys). All of the network poths are displayed in the table below. Determine the expected duration and variance of each of the paths, and indicate whether or not each path is critical. If there are only three paths, type -1 in the duration cell in fourth row of the answer table below, and select NA in the critical poth column. State all durations and variances exactly (i.e. not as rounded decimals)