Question

Twelve​ samples, each containing five​ parts, were taken from a process that produces steel rods at Emmanual​ Kodzi's factory. The length of each rod in the samples was determined. The results were tabulated and sample means and ranges were computed. The results​were:

                                                                                                                            

Sample	Sample Mean​ (in.)	Range​ (in.)	Sample	Sample Mean​ (in.)	Range​ (in.)
1	12.30412.304	0.0330.033	7	12.30312.303	0.0410.041
2	12.30012.300	0.0410.041	8	12.30312.303	0.0340.034
3	12.29312.293	0.0340.034	9	12.29712.297	0.0270.027
4	12.30812.308	0.0510.051	10	12.30112.301	0.0290.029
5	12.29912.299	0.0310.031	11	12.30312.303	0.0390.039
6	12.301	0.0360	12	12.306	0.047

For the given​ data, the

x double overbarx

​=

nothing

inches ​(round your response to four decimal​ places).

Answer 1

Answer: Xbarbar= 12.3023

Explanation:

R= Max- Min	X-bar= average of sample
0.033	12.304
0.041	12.300
0.034	12.293
0.051	12.308
0.031	12.299
0.036	12.301
0.041	12.312
0.034	12.303
0.027	12.297
0.029	12.301
0.030	12.303
0.047	12.306
0.036	12.302
R-bar (Average of above values)	X-bar-bar (average of above values)