QUESTION 5

1. Installing a muffler at Barut Garage, Inc. involves a five work tasks. Azra 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	4	7	3	5	85
   2	Remove old muffler	8	7	5	5	7	5	5	100
   3	Install new muffler	13	13	12	14	11	12	11	110
   4	Inspect the work	4	4	4	4	3	4	3	120
   5	Complete paperwork	8	8	10	7	7	8	7	120

   Given that Azra does not want an error of more than 0.03 and a confidence level less than 0.85 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 Azra factors in a total of fatigue and personal allowance of 0.10 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