Tasks X$,$ Y$,$ and Z must be completed in series to complete a project. The three time estimates $($optimistic$,$ most likely, and pessimistic$)$ for each task in days are X: $30,45,$ and $66$ days; Y: $24,42,$ and $60$ days; and Z: $26,50,$ and $68$ days. For each task, calculate

the expected time, te

the standard deviation, sigma

What is the standard deviation for the complete project? Enter this number, but enter only the number to one decimal place $($do not enter the word 'days'$).$Tasks X$,$ Y$,$ and Z must be completed in series to complete a project. The three time estimates $($optimistic$,$ most likely, and pessimistic$)$ for each task in days are X: $30,45,$ and $66$ days; Y: $24,42,$ and $60$ days; and Z: $26,50,$ and $68$ days. For each task, calculate

the expected time, te

the standard deviation, sigma

What is the standard deviation for the complete project? Enter this number, but enter only the number to one decimal place $($do not enter the word 'days'$).$