The following samples have been taken from an on-going process. Use these values to create both an X bar and an R chart, and then answer the questions below.

Sample 1: 56 48 53 58 52

Sample 2: 50 59 57 56 54

Sample 3: 61 59 56 55 58

Sample 4: 57 51 52 57 50

Sample 5: 52 49 57 55 56

Sample 6: 56 55 60 58 55

1. What is the value of the centerline for x bar chart? (round to two decimal places )

2. The upper control limit of x bar chart is?

3. The lower control limit for x batr chart is?

4. The upper control limit of the R chart is?

5. The lower control limit for R chart is ?