How do you determine standard deviation?
Problem: This is a sample problem right out of the book (1949 edition). My difficulty is understanding the formulas. I am having to relearn stuff that was taught in college 40 years ago. Test is Dec 21.
Tree Number
Diameter of Trees
2 2
3 3
4 6
5 7
6 9
7 13
8 10
9 16
10 12
11 12
12 9
13 9
14 8
15 9
16 3
17 0
18 2
19 2
20 1
21 2
22 0
23 1
24 2
25 1
26 0
27 0
28 0
29 0
30 1
Total 140