Activity A duration $10,$ variancr $1\mathrm{.}2,$ BA expected furation $5,$ variance duration $1\mathrm{.}00,$ A expected duration $15,$ varuance of duration $2\mathrm{.}4,$ B$,$C expected dutation $11,$ variance $1\mathrm{.}5,$ Dexpected duration $10,$ variance $1\mathrm{.}8.$ from the above projet, what is the probabity that the project will be completed in $50$ mons