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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 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 the results?

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Answer:

1 495 500 505 500

2 525 515 505 515

3 470 480 460 470

Step-by-step explanation:

Suppose to be sample are

  • 495 500 505 500
  • 525 515 505 515
  • 470 480 460 470              

In the given sample if sample 3 is difficult to control .Because engineer wants to construct a sample mean controlling the service to his company produces.In sample set first two sets have continuous four headlamps but in third it is difficult to handle the control.

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