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Part B - Problems In the following problems assume that a worker works 8 hours a day. P1) (12 points) Laminate floor can be installed at a rate of 60 it? per worker hour. The floor of an office area (300 f x 70 ft) is to be covered with this. If each worker is paid 21 S/hr including the overhead, find: (a) If one worker is assigned to this task, what duration to the nearest whole day) should be assigned to this activity? (b) If four workers are assigned to this task, what duration (to the nearest whole day should be assigned to this activity? (c) What is the total labor cost? P2) (12 points) A concrete block wall can be constructed in an average time of 30 days with a standard deviation of 7 days. (a) What duration should be used if there is to be a 97% confidence that the duration will not be exceeded? (b) What duration should be used if there is to be a 92% confidence that the duration will not be exceeded? (c) What is the probability that the duration 40 days will not be exceeded? Cost estimates may be developed as follows: quantity of work $ labor cost qty/crew-hour crew-hour Duration of the activity is assumed to be: quantity of work qty/crew-hour crew-hour crew-hours or hour/day days Dp =D +x.SD % Ds Duration with p% of confidence Dmea: Mean or average Duration x: bell diagram factor (Area under a standard normal curve) Table 4.3 SD: Standard Deviation