Business, 18.10.2019 00:30 SmokeyRN

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:
what is the standard deviation of the sampling distribution of sample means for whenever service life is in control?
select one:
a. 10 hours
b. 6.67 hours
c. 11.55 hours
d. 5 hours
e. 20 hours

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Adesign engineer wants to construct a sample mean chart for controlling the service life of a haloge...

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