According to the program evaluation review technique, if a project has an ompletion $T_e$ of $45$ weeks with a standard deviation $,$ of $7$ weeks, calculate ompleting it$,$

$($i$)$ within $52$ weeks

$($ii$)$ within $38$ weeks

$te=\frac{a+4m+b}{6}$

$=\frac{b-a}{6}$