Answer to Question #348151 in Management for Paballo

Question

2.4 A quality engineer in charge of a coffee filter pack production line was concerned about 

the weight (in grams) of the filter packs being produced. The quality team sampled three 

packs every hour, throughout the production day. The table below shows the results: 

Sample

number Weight (g)

1 20.6 21.1 20.7

2 20.1 20.0 20.3

3 20.6 21.2 21.3

4 21.5 22.2 21.4

5 21.4 21.1 19.9

6 21.1 22.3 19.9

7 21.4 20.9 21.1

Calculate the control limits for an 

x

chart, based on the range.