Question: QUESTION 1 A design engineer wants to construct a sample mean chart for controlling the service life of a halogen headlamp is company produce knows

QUESTION 1 A design engineer wants to construct a sample mean chart for controlling the service life of a halogen headlamp is company produce knows from numerous previous samples that service is normally distributed with a mean of 500 hours and a standard deviation of 20 hours. Ons four recent production butches, he tested service on random samples of four headlamps with these results Sample Service Ute Hours 0:00am 10am 200m 2pm 405 Sos 500 b SOO 510 SOS 515 sos SOS 450 500 515 531 1.5 points) What is the sample mean service life for sample 2? 460 Hours 495 Hours 500 Hours 509 Hours 525 Hours

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