Study Question:

Installing a muffler at Joe's Garage, Inc. involves a five work tasks. Kelly has timed workers performing these tasks seven times, with the results (in minutes) shown in the following table.

No	Tasks	1	2	3	4	5	6	7	PR
1	Select correct mufflers	5	4	6	3	3	5	4	100
2	Remove old muffler	5	7	8	6	7	6	5	110
3	Install new muffler	12	15	14	13	15	13	11	100
4	Inspect the work	4	4	3	3	4	4	4	100
5	Complete paperwork	9	10	10	7	8	8	7	90

Given that Kelly does not want an error of more than 0.08 and a confidence level less than 0.80 answer the following: Provide the z-score: Round to the nearest hundredth, for example 4.22 Does the number of observations for the following tasks warrant such confidence level? Enter YES or NO. Task # 3 Install new muffler : Task # 5 Complete paperwork : What are the required numbers of observations for these tasks? Enter the number. Task # 3 Install new muffler : Task # 5 Complete paperwork : Assume that the number of observations for the following tasks justifies the confidence level and accuracy mentioned above. Also note that Kelly factors in a total of fatigue and personal allowance of 0.15 applied to job time. Provide the following results from your solution:

Task	Normal Time*	Standard Time*
# 2 Remove old muffler	min	min
# 4 Inspect the work	min	min

Provide the total standard time* for the whole job: minutes. *Round to the nearest hundredth, for example 8.45 minutes