An initial time study was done on a process with the following results $($in minutes$).$ Based on the data obtained so far, assuming an allowance of $20$ percent of the normal time, what do you estimated for the time per customer served, based on this preliminary sample? Element Obs $1$ Obs $2$Obs $3$ Obs $4$ Obs $5$ Performance Rating $701104543310$ Element Element $2$ Element $38911109068776$