the manager of the Rock Department stops back and asks you to also construct an X/R control chart for the data he provided since he is a bit nervous that his operators may not be able to do the standard deviation calculations for each subgroup.He also wants a new process capability index for this type of chart

1 74.030 74.002 74.019 73.992 74.008

2 73.995 73.992 74.001 74.011 74.004

3 73.988 74.024 74.021 74.005 74.002

4 74.002 73.996 73.993 74.015 74.009

5 73.992 74.007 74.015 73.989 74.014

6 74.009 73.994 73.997 73.985 73.993

7 73.995 74.006 73.994 74.000 74.005

8 73.985 74.003 73.993 74.015 73.988

9 74.008 73.995 74.009 74.005 74.004

10 73.998 74.000 73.99 74.007 73.995

11 73.994 73.998 73.994 73.995 73.99

12 74.004 74.000 74.007 74.000 73.996

13 73.983 74.002 73.998 73.997 74.012

14 74.006 73.967 73.994 74.000 73.984

15 74.012 74.014 73.998 73.999 74.007

16 74.000 73.984 74.005 73.998 73.996

17 73.994 74.012 73.986 74.005 74.007

18 74.006 74.010 74.018 74.003 74.000

19 73.984 74.002 74.003 74.005 73.997

20 74.000 74.01 74.013 74.020 74.003

21 73.982 74.001 74.015 74.005 73.996

22 74.004 73.999 73.99 74.006 74.009

23 74.01 73.989 73.99 74.009 74.014

24 74.015 74.008 73.993 74.000 74.010

25 73.982 73.984 73.995 74.017 74.013