Standard deviations:
calculating formula
Y
Y
2
f
fY
2
fY
3
9
0
0
0
8
64
1
64
8
13
169
6
1014
78
18
324
19
6156
342
23
529
33
17,457
759
28
784
17
13,328
476
76
38,019
1663