Statistic Calculation Problem

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gas20152.xlsx

Sheet1

Gas Station Price
1 2.411
2 2.406
3 2.376
4 2.375
5 2.372
6 2.388
7 2.457
8 2.520
9 2.553
10 2.584
11 2.619
12 2.622
13 2.651
14 2.670
15 2.725
16 2.758
17 2.788
18 2.761
19 2.746
20 2.743
21 2.750
22 2.765
23 2.749
24 2.760
25 2.778
26 2.778
27 2.753
28 2.712
29 2.671
30 2.617
31 2.595
32 2.582
33 2.549
34 2.532
35 2.536
36 2.534
37 2.485
38 2.432
39 2.434
40 2.382