Bongo's nut bar is produced at a highly automated facility.One of the quality control factors is the weight of each bar.Samples of 10 bars are taken regularly and adjustments are made based on the outcome of quality control process.Average weights and ranges of the latest samples are reported as following:

Sample Average Weight (gram) Range

1 51 5

2 53 4

3 48 1

4 49 3

5 52 2

1)What is the upper control limit of X bar chart?

A.50.5

B.51.1

C.51.5

D.52.3

2)What is the lower control limit of R chart?

A.0.67

B.0.74

C.0.81

D.Not computable

3)What is the status of production process based on this report?

A.Both R and X bar charts indicate that the process is out of statistical control

B.R chart indicates that process is out of statistical control but not X barchart

C.X bar chart indicates that process is out of statistical control but not R chart

D.Both R and X bar charts indicate that the process is in statistical control