A machine fills boxes with cereal. The labeled weight is 9 oz. The quality control department sampled three boxes every day for four days.

The samples are as follows (You may download the table from the following Excel file to facilitate calculation X R Charts Data 3.xlsx ):

Sample	Box Weights
1	9.46	9.12	8.76	8.65
2	9.08	8.62	8.79	9.27
3	8.75	9.38	8.62	9.03

The X double bar of samples is_______ . The R bar of the samples is ._________The lower control limit (LCL) of X bar chart is_______ (refer to the table below if necessary). The upper control limit (UCL) of R bar chart is ________(refer to the table below if necessary) (Keep two decimal points).

		Factor for R Chart
Number of Observations in Subgroup	Factor for x-bar Chart	Lower Control Limit	Upper Control Limit
n	A2	D3	D4
2	1.88	0.00	3.27
3	1.02	0.00	2.57
4	0.73	0.00	2.28