Question(2): The following figures give the number of defectives in 20 samples, each sample containing 2000 items. 425 430 216 341 225 322 280 306 337 305 356 402 216 409 193 326 280 389 Calculate the values for centre line and the control limits for p chart. Draw the p-chart and comment if the process can be regarded in control or not?

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