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A random sample of 80 rubber party balloons is drawn from each days production and tested for air leaks. They are classifies simply as either acceptable or reject. Plot a control chart for the process and, based upon the observations below, determine whether or not the process is in control Day No. reiected in sample 4 4 10 12 13 4 16 18 19 20 4 23 24 25 4

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9 8 7 -No of rejected sample 5 Mean 4 -U pper lim it Lower Lim it 2 1 1 3 5 79 11 13 15 17 19 21 23 25from the above graph it can be determined that the process is in control

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