Installing mufflers at the Stanley Garage in$$ Brandon, Manitoba, involves five work elements. Linda Stanley has timed workers performing these tasks seven$$ times, with the results shown in the following table.

$$

Performance

Observation$($minutes$)$

Element

Rating

$1$

$2$

$3$

$4$

$5$

$6$

$7$

Select correct muffler

$110$

$\%$

$4$

$5$

$4$

$6$

$4$

$15$

$*$

$4$

Remove old muffler

$90$

$\%$

$6$

$8$

$7$

$6$

$7$

$6$

$7$

$$Weld$/$install new muffler

$105$

$\%$

$15$

$14$

$14$

$12$

$15$

$16$

$13$

$$Check$/$inspect work

$100$

$\%$

$3$

$4$

$24$

$*$

$5$

$4$

$3$

$18$

$*$

Complete paperwork

$130$

$\%$

$5$

$6$

$8$

minus

$7$

$6$

$7$

$*$Employee has lengthy conversations with boss$($not job$$ related$).$

By agreement with her$$ workers, Stanley allows a $10\%$ fatigue factor and a $10\%$personal$-$time factor. To compute the standard time for the work$$ operation, Stanley excludes all observations that appear to be unusual or nonrecurring. She does not want an error more than $5\%.$

Part $2$

$$a$)$ The normal time for the overall process is

$$

enter your response here minutes $($round your response to two decimal$$ places$).$

Part $3$

The standard time for this process is

$$

enter your response here minutes $($round your response to two decimal$$ places$).$

Part $4$

$$b$)$ The number of observations that are required for a $95\%$ confidence level within $5\%$ accuracy is

$$

enter your response here observations $($round your response to the immediate higher whole$$ number$).$

a$)$ The normal time for the overall process isminutes $($round your response to two decimal places$).$The standard time for this process isminutes $($round your response to two decimal places$).$b$)$ The number of observations that are required for a $95\%$ confidence level within $5\%$ accuracy isobservations $($round your response to the immediate higher whole number$).$