1. Draw mean chart
2. Draw range chart
3. and comment on the result in the two charts

Refrigerator temperature
Days	Morning shift	Afternoon shift
1	3	2.4
2	4.1	4.2
3	4.3	4.8
4	4.8	4
5	4.5	4
6	4.5	4.8
7	5	4.8
8	4.2	4.2
9	3.8	4.3
10	4.2	4
11	3.2	4.2
12	3	4.1
13	4.2	4
14	4.5	4.3
15	3.8	4.2
16	5.2	5.1
17	3.8	5
18	4.2	4
19	4.3	5.2
20	5.1	5.3
21	4.9	5.2
22	4.7	5.4
23	4.9	4.2
24	3.9	4.5
25	4.5	4.9
26	5.3	3.3
27	3.9	4.1
28	4.4	4.1
29	4.5	4.6
30	4.2	4.8