Question content area

Part $1$

An initial time study was done on a process with the following results$($in minutes$).$ Based on the data obtained so$$ far, assuming an allowance of $13$ percent of the normal$$ 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 $1$

$70$

$3$

$5$

$6$

$3$

$6$

Element $2$

$130$

$9$

$10$

$10$

$8$

$9$

Element $3$

$120$

$8$

$7$

$6$

$7$

$6$

Part $2$

The time per unit customer served is

$$

enter your response here minutes. $($Enter your response rounded to two decimal$$ plac