X $=8\mathrm{.}15$

In a biscuit factory locating in Izmit, industrial engineers have decided to implement time study analysis to increase productivity of one of the work stations. At the work station, one of the operations composed of A$,$ B$,$ and $C$ tasks, is analyzed. Observations are displayed in the following table. The allowance time for this operation is set to $8\%.$ Based on these, compute normal times and standard time for the operation for a $90\%$ confidence interval.

$\backslash$table$[[,$Tasks$],[$Observations$,$A$,$B$,$C$],[1,x,7\mathrm{.}45,5\mathrm{.}22],[2,8\mathrm{.}25,7\mathrm{.}75,5\mathrm{.}36],[3,7\mathrm{.}55,8\mathrm{.}05,5\mathrm{.}78],[4,8\mathrm{.}05,7\mathrm{.}55,5\mathrm{.}55],[5,8\mathrm{.}00,7\mathrm{.}50,5\mathrm{.}48],[\backslash$table$[[$Performance$],[$Rating $(\%)]],85,95,110]]$

$\backslash$table$[[\backslash$table$[[$Sum of$],[$the$],[$numbers$],[$in your$],[$student$],[$ID$]],x$