Using$$ PERT, Adam Munson was able to determine that the expected project co$$months$,$ and the project variance is $4$

Part $2$

$$a$)$ The probability that the project will be completed in $1818$ months$=0\mathrm{.}0228($round your response to four decimal$$ places$).$

Part $3$

$$b$)$ The probability that the project will be completed in $21$ months$=$ enter your response here $($round your response to four decimal$$ places$).$