I could use some assistance...

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 6 3 4 4 4 6 4 85 2 Remove old muffler 7 7 8 6 6 5 7 120 3 Install new muffler 11 13 15 12 15 12 15 120 4 Inspect the work 4 3 4 4 3 3 4 100 5 Complete paperwork 7 7 7 7 9 7 8 120 Given that Azra does not want an error of more than 0.06 and a confidence level less than 0.90 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 0.05 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 minutes. Provide the total standard time* for the whole job: *Round to the nearest hundredth, for example 8.45 minutes