Question 8. [Marks: 10] a) Work Sampling is a very important tool for machine planning- illustrate this statement [2] with an example. b) Do you think work should be divided into element with respect to time measurement? Infer [4] your answer according to the benefits and limitation of that division. c) Installing muffers involves five work elements as given in Table Q8(c) provided in the [4] following page. According to the company policy, a 10% fatigue factor and a 10% personal time factor are allowed. The company excludes all observations that appear to be unusual or nonrecurring. The company does not want an error more than 5%. Page 7 of 8 Table Q8(c) Cycle Time (in minutes) 3 4 5 1 2 6 7 Performance Rating (%) 110 4 5 4 6 4 15 4 6 8 7 6 7 6 90 Job Elements Select correct muffers Remove old muffer Weld/Install new muffer Check/Inspect work Complete paperwork 15 14 14 12 15 16 13 105 will 4 24 5 4. 3 18 100 5 6 8 7 6 7 130 i) Measure the standard time for the task. ii) Recommend the number of cycles that are needed to assure a 95% confidence level