http://www.ck12.org Chapter 6. Normal Distribution Curves
TABLE6.4:(continued)
x (x−μ) (x−μ)^2
16.4 3.7 13.69
4.8 − 7. 9 62.41
15.2 2.5 6.25
13.0 0.3 0.09
14.4 1.7 2.89
12.7 0 0
8.6 − 4. 1 16.81
12.9 0.2 0.04
11.5 − 1. 2 1.44
14.6 1.9 3.61μ=
∑x
n=
228. 6
18
≈ 12. 7
σ^2 =
∑(x−μ)^2
n
σ^2 =136. 86
18
≈ 7. 6
The variance of the data set is approximately 7. 6 ◦C.
TABLE6.5: Precipitation (mm)
x (x−μ) (x−μ)^2
18.6 − 54. 5 2970.3
37.1 − 36. 0 1296
70.9 − 2. 2 4.84
102.0 28.9 835.21
59.9 − 13. 2 174.24
58.0 − 15. 1 228.01
73.0 − 0. 1 0.01
77.6 4.5 20.25
89.1 16.0 256
86.6 13.5 182.25
40.3 − 32. 8 1075.8
119.5 46.4 2153
36.2 − 36. 9 1361.6
85.5 12.4 153.76
59.2 − 13. 9 193.21
97.8 24.7 610.09
122.2 49.1 2410.8
82.6 9.5 90.25