Question: A new machine that fills tubes of toothpaste will be monitored using statistical process control. The following data were collected while the machine was closely

A new machine that fills tubes of toothpaste will be monitored using statistical process control. The following data were collected while the machine was closely monitored and under control. Each day a random sample of six tubes are weighed. Based on the data, the process mean is 6.752.

What is the lower control limit for the x-bar chart rounded to three decimal places?
a. 6.816
b. 6.676
c. 6.688
d. 6.828

6.91 6.84 6.71 6.76 6.70o 6.79 6.78 6.71 6.72 6.72 6.79 6.72 6.71 6.72 Monday Tuesday Wednesday 6.83 6.74 6.75 6.80 6.79 6.70 6.71 6.74 Thursday Friday 6.80 6.72 6.68 6.79 6.71 6.75 6.65

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