A design engineer wants to construct a sample mean chart for controlling the ser
ID: 399146 • 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?
Multiple Choice
525 hours
515 hours
500 hours
460 hours
495 hours
Sample Service Life (hours) 1 495 500 505 500 2 525 515 505 515 3 470 480 460 470Explanation / Answer
According to the given data , Putting the data in eqaution Provides
Mean service life sample for sample 2 = 515 hrs
P.S.- Please leave a comment if any explanation is needed.