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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
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
Sample | Service Life (hours) | |||
1 | 495 | 500 | 505 | 500 |
2 | 525 | 515 | 505 | 515 |
3 | 470 | 480 | 460 | 470 |
What is the sample mean service life for sample 2?
Group of answer choices
460 hours
495 hours
500 hours
515 hours
525 hours
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