Question: design engineer wants to construct SPC chart for controlling the service life of a halogen headlamp his company produces. On three recent production batches, he

design engineer wants to construct SPC chart for controlling 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, with these results:
Which control chart should he construct for this purpose?
R chart
Mean chart
Mean chart and R chart
C chart
P chart

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