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The four sides of a printed circuit board (PCB) enclosure consist of two pieces selected from...

The four sides of a printed circuit board (PCB) enclosure consist of two pieces selected from a population whose mean length is 30 cm with standard deviation 0.14, and two pieces selected from a population whose mean length is 45 cm with standard deviation 0.31 cm. Assuming the four pieces are chosen independently, the standard deviation of the perimeter

Math   Statistics-And-Probability   
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