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

Transcribed Image Text:

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