Mathematics, 12.11.2020 17:10 hellicuh
A design engineer wants to construct a sample mean chart for controlling the service life of a halogen headlamp his company produces. He knows from numerous previous samples that this service life is normally distributed with a mean of 500 hours and a standard deviation of 20 hours. On three recent production batches, he tested service life on random samples of four headlamps, with these results: Sample Service Life (hours) 1 495 500 505 500 2 525 515 505 515 3 470 480 460 470 If he uses upper and lower control limits of 520 and 480 hours, on what sample(s) (if any) does service life appear to be out of control?
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Mathematics, 21.06.2019 17:30
Give the equations of two different lines that are perpendicular to the line 3x + 4y = 7.
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Mathematics, 21.06.2019 21:30
Ten members of balin's soccer team ran warm ups for practice. each member ran the same distance. their combined distance was 5/6 of a mile. to find the distance that each member ran, balin wrote the expression below.
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Mathematics, 21.06.2019 23:30
Consider the sequence below. 3 , 1 , 1/3 , 1/9 , select the explicit function which defines the sequence.
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