Consider the following work breakdown structure:

$\backslash$table$[[,,$Time Estimates $($days$)],[$Activity$,$Precedes,Optimistic,Most Likely,Pessimistic,$],[$Start$,$A$,$B$,-,-,-,],[$A$,$C$,$D$,44,50,56,],[$B$,$D$,45,60,75,],[$C$,$E$,42,45,48,],[$D$,$F$,31,40,49,],[$E$,$F$,27,36,39,],[$F$,$End,$58,70,82,]]$

What is the estimated standard deviation in the time for activity E$?$

Multiple Choice

$1$ day