FE Civil Engineering Exam Prep

The given numbers are daily groundwater elevation readings from a monitoring well taken during a month experiencing snowmelt and extended rainfall events. What is the sample variance of these groundwater elevation readings?

7.6
7.6
7.7
7.7
4.3
4.3
5.9
5.9
5.0
5.0
10.5
10.5
7.7
7.7
9.5
9.5
12.0
12.0
12.6
12.6
7.6
7.7
4.3
5.9
5.0
10.5
7.7
9.5
12.0
12.6
6.5
6.5
8.3
8.3
8.2
8.2
13.2
13.2
12.6
12.6
13.6
13.6
14.1
14.1
13.5
13.5
11.5
11.5
12.0
12.0
6.5
8.3
8.2
13.2
12.6
13.6
14.1
13.5
11.5
12.0
10.4
10.4
10.8
10.8
13.1
13.1
12.5
12.5
10.4
10.4
13.0
13.0
14.1
14.1
15.1
15.1