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 when this service life is in control it 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 mean of the sampling distribution of sample means when the service life is in control?
Definitions:
Crackles
A type of abnormal lung sound heard through a stethoscope, often resembling the sound of hair being rubbed together, indicative of fluid in the air spaces.
Neck Vein Distention
The swelling or protruding of neck veins, often indicative of increased venous pressure or heart conditions.
Diuretic
A type of medication or substance that promotes the production and excretion of urine, often used to treat high blood pressure and fluid retention.
Hypokalemia
A medical condition characterized by lower than normal levels of potassium in the bloodstream.
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