3. We are interested in seeing if 4-ounce chocolate bars are being accurately created to contain 4-ounces. Random samples of size 4 were taken and weighed. Five hours of observation provided the following data:

Sample	Mean	Range
1	3.92	0.08
2	4.07	0.12
3	3.91	0.19
4	4.09	0.16
5	3.75	0.21

a. Find the UCL for the R chart.

b. Find the LCL for the R chart.

c. Is this chart in control? Why/why not?

d. Find the UCL for the x-chart.

e. Find the LCL for the x-chart.

f. Is this process in control? Why/why not?