1-For about 45 minutes each day, a worker is required to lift 28 pound bags of m
ID: 2931750 • Letter: 1
Question
1-For about 45 minutes each day, a worker is required to lift 28 pound bags of material off a conveyor (38 inches high) and place them on a truck bed (46 inches high) at a frequency of 6 bags per minute. The bags are approximately 15 x 18 x 5 inches). As the bags are placed on the truck, the worker twists about 60°. Find the RWL and LI for this task. Show your calculations and the adjustment factors for your calculations.
2-Static arm strength (in pounds) from industrial workers was found to be N(44.9, 17.6) for females and N(85.8, 28.6) for males. What strengths would you expect for a 25th %tile female and for a 5th %tile male?
3-You are asked to recommend chairs for a large work area. Your text offers the following data on popliteal height:
5th %tile 50th %tile 95th %tile
Males 39.2 cm 44.2 cm 48.8 cm
Females 35.5 cm 39.8 cm 44.3 cm
If your boss wants to accommodate the 1st percentile female to the 97.5th percentile male (based on popliteal ht), find the minimum and maximum seat height needed to accommodate the desired range.
Explanation / Answer
2)
Static arm strength (in pounds) from industrial workers was found to be N(44.9, 17.6) for females and
N(85.8, 28.6) for males.
25%tile
P(Z< z*) = 0.25
z* = -0.674
hence 25th %tile female
= 44.9 -0.674*sqrt(17.6) {Assuming 17.6 is variance}
=42.0724
P(Z <z*) = 0.05
z* = -1.645
5th %tile male = 85.8 -1.645 *sqrt( 28.6 ) {Assuming 28.6 is variance}
=77.0027
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