An initial time study was done on a process with the following results$($in minutes$).$ Based on the data obtained so$$ far, assuming an allowance of $1414$ percent of the normal$$ time, what do you estimate for the time per customer$$ served, based on this preliminary$$ sample? $($Round all intermediate calculations to two decimal$$ places.$)$

$$

Element

Performance

Rating

Obs

$1$

Obs

$2$

Obs

$3$

Obs

$4$

Obs

$5$

Element $1$

$7070$

$33$

$33$

$44$

$66$

$33$

Element $2$

$110110$

$88$

$1111$

$99$

$1111$

$1010$

Element $3$

$8080$

$77$

$77$

$66$

$88$

$88$

Part $2$

The time per unit customer served is enter your response here minutes. $($Enter your response rounded to two decimal$$ places.$)$