Question: In statistical process control, the hourly samples are taken. The sample means are: 156.46, 199.62, 189.31, 102.22, and 112.09 respectively. Also, the ranges of these

In statistical process control, the hourly
In statistical process control, the hourly samples are taken. The sample means are: 156.46, 199.62, 189.31, 102.22, and 112.09 respectively. Also, the ranges of these samples are 11.97, 12.17.13.94, 11.86, and 11.83 respectively. If the upper controllimit of X-bar chart is 157.87, what is the sample size of each sample? O a. 7 O b. 6 Oc4 O d. 5 Oe. None is correct

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