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A design engineer measured the service life of a halogen headlamp his company produces. On three recent production batches, he tested service life on

A design engineer measured the service life of a halogen headlamp his company produces. On three recent production batches, he tested service life on random samples of four headlamps each. sample 1 2 3 Service life (hours) 495 525 470 What is the sample mean service life for sample 2? A 515 B 500 C) 495 500 500 505 515 505 515 470 460 480 Gradi

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