Adesign 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
1 495 500 505 500
2 525 515 505 515
3 470 480 460 470
what is the sample mean service life for sample 2?
a) 460 hours
b) 495 hours
c) 515 hours
d) 525 hours
Answers: 1
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Answers: 2
Business, 22.06.2019 20:00, jakepeavy70
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