Samples of size 5 provided the following 20 sample means for a production process that is believed to be in control.

a. Based on these data, what is an estimate of the mean when the process is in control?
b. Assume that the process standard deviation is σ .50. Develop the x-bar control chart for this production process. Assume that the mean of the process is the estimate developed in part (a).
c. Do any of the 20 sample means indicate that the process was out of control?

95.72 95.24 95.18 95.44 95.46 95.32 95.40 95.44 95.08 95.50 95.8095.22 95.56 95.22 95.04 95.72 94.82 95.46 95.60 95.78