A design engineer wants to construct a sample mean chart for controlling the ser
ID: 339536 • Letter: A
Question
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:
What is the sample mean service life for sample 2? (Keep two decimal places)
Sample Hours 1 502 494 470 503 2 511 500 508 508 3 508 509 517 498Explanation / Answer
TAKE AVERAGE OF THE SAMPLE #2
sample mean service life for sample 2
=(511+500+508+508)/4 =
506.75
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