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 is
1 answer:
Answer:
Step-by-step explanation:
let X1,X2 represents the length of two pieces selected from a population
the mean and standaerd deviation for the length of these two pieces X1,X2 is 30 cm and 0.14 cm
let X2,X3 represents the length of two pieces selected from a population
the mean and standaerd deviation for the length of these two pieces X2,X3 is 45 cm and 0.31 cm
To be continued on the attachment:
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