A project was planned using PERT with three time estimates. The expected completion time of the project was determined to be $40$ weeks. The variance of the critical path is $9.$ What is the probability that the project will be finished in $46$ weeks or less? $(1$ Point$)0\mathrm{.}5$ O $0\mathrm{.}74540\mathrm{.}9772$ None of the alternatives $0\mathrm{.}0228$