It is intended that 90% of electronic devices emerging from a machine should pass a simple on-the-spot quality test. The numbers of defectives among samples of 50 taken by successive shifts are as follows:

Find the action and warning limits, and the sample number at which an out-of-control decision is taken. Also find the UCL (United States practice) and the sample number for action.

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5, 8, 11, 5, 6, 4, 9, 7, 12, 9, 10, 14